diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a59e44b..4c168cb 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -8,7 +8,7 @@ on:
       - master
 
 jobs:
-  upload-assets:
+  test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
diff --git a/README.md b/README.md
index c154eb9..7ff3db5 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ bisection-key
 ### Usage
 
 ```edn
-[cirru/bisection-key "0.1.5"]
+[cirru/bisection-key "0.1.6-a1"]
 ```
 
 [![Clojars Project](https://img.shields.io/clojars/v/cirru/bisection-key.svg)](https://clojars.org/cirru/bisection-key)
@@ -32,6 +32,9 @@ bisection-key.core/max-id ; "z"
 (bisection-key.util/assoc-before v "b" 2) ; (assoc v "aT" 2)
 (bisection-key.util/assoc-prepend v 2) ; (assoc v "G" 2)
 (bisection-key.util/assoc-append v 2) ; (assoc v "n" 2)
+
+(bisection-key.util/get-min-key v) ; "a"
+(bisection-key.util/get-max-key v) ; "b"
 ```
 
 Charset:
diff --git a/calcit.cirru b/calcit.cirru
index b5e39a8..64d638e 100644
--- a/calcit.cirru
+++ b/calcit.cirru
@@ -1,5 +1,8 @@
 
 {}
+  :users $ {}
+    |root $ {} (:id |root) (:name |root) (:nickname |root) (:password |d41d8cd98f00b204e9800998ecf8427e) (:avatar nil) (:theme :star-trail)
+    |Q7nwO-CJS $ {} (:name |chen) (:id |Q7nwO-CJS) (:nickname |chen) (:avatar nil) (:password |d41d8cd98f00b204e9800998ecf8427e) (:theme :star-trail)
   :ir $ {} (:package |bisection-key)
     :root $ {} (:ns |main) (:def |main!)
     :files $ {}
@@ -725,8 +728,10 @@
                         |x $ {} (:type :leaf) (:by |root) (:at 1514652854417) (:text |assoc-after) (:id |HyQ3nEBH7M)
                         |v $ {} (:type :leaf) (:by |root) (:at 1514652851815) (:text |assoc-before) (:id |rJK2VHrXz)
                         |yj $ {} (:type :leaf) (:by |root) (:at 1514691488265) (:text |assoc-prepend) (:id |BygNiiCSQf)
+                        |yx $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475787386) (:text |get-max-key) (:id |X0rxpPMS4)
                         |r $ {} (:type :leaf) (:by |root) (:at 1514652493004) (:text |key-after) (:id |S1G8QHr7z)
                         |y $ {} (:type :leaf) (:by |root) (:at 1514691258177) (:text |key-prepend) (:id |Syl1acArQM)
+                        |yv $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475784819) (:text |get-min-key) (:id |WGeKbJssa)
         :defs $ {}
           |test-frequent-prepend $ {} (:type :expr) (:by |root) (:at 1514650058549) (:id |SyeXCY4SXM)
             :data $ {}
@@ -844,6 +849,114 @@
                             :data $ {}
                               |T $ {} (:type :leaf) (:by |root) (:at 1514691523691) (:text ||m) (:id |r1eNniRrmf)
                               |j $ {} (:type :leaf) (:by |root) (:at 1514691504630) (:text |2) (:id |SyM_3i0r7G)
+          |test-get-key $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475752193)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475763424) (:text |deftest) (:id |ac7ME_cP2b)
+              |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475752193) (:text |test-get-key) (:id |IHnJcAz1pf)
+              |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475752193)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475766988) (:text |testing) (:id |hU8AdPOsd3)
+                  |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475821281) (:text "|\"get min key") (:id |80mXuwB0x-)
+                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475771142)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475772300) (:text |is) (:id |bnJZOKpbyo)
+                      |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475773445)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475773260) (:text |=) (:id |OacItKCy3l)
+                          |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475775258) (:text "|\"a") (:id |3E-zk-v8t)
+                          |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475778411)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475797275) (:text |get-min-key) (:id |bxUeD5fb6)
+                              |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475798062)
+                                :data $ {}
+                                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475798451) (:text |{}) (:id |dnpf1QKayt)
+                                  |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475798766)
+                                    :data $ {}
+                                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475800408) (:text "|\"a") (:id |mec59oWqb9)
+                                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475800852) (:text |1) (:id |GjN4AZRdDB)
+                                    :id |2_fgIGDJiw
+                                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475801505)
+                                    :data $ {}
+                                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475804666) (:text "|\"b") (:id |mmoyoo4KB5leaf)
+                                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475805791) (:text |2) (:id |NsHTGD6fN)
+                                    :id |mmoyoo4KB5
+                                :id |maFuFTfnB
+                            :id |v6XbojZ7T
+                        :id |n7fDkiHlRW
+                    :id |gRd12G8yH
+                :id |T_mQfumzYD
+              |v $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475752193)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475766988) (:text |testing) (:id |hU8AdPOsd3)
+                  |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475770285) (:text "|\"get max key") (:id |80mXuwB0x-)
+                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475771142)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475772300) (:text |is) (:id |bnJZOKpbyo)
+                      |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475773445)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475773260) (:text |=) (:id |OacItKCy3l)
+                          |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475826789) (:text "|\"b") (:id |3E-zk-v8t)
+                          |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475778411)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475833413) (:text |get-max-key) (:id |bxUeD5fb6)
+                              |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475798062)
+                                :data $ {}
+                                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475798451) (:text |{}) (:id |dnpf1QKayt)
+                                  |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475798766)
+                                    :data $ {}
+                                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475800408) (:text "|\"a") (:id |mec59oWqb9)
+                                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475800852) (:text |1) (:id |GjN4AZRdDB)
+                                    :id |2_fgIGDJiw
+                                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475801505)
+                                    :data $ {}
+                                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475804666) (:text "|\"b") (:id |mmoyoo4KB5leaf)
+                                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475805791) (:text |2) (:id |NsHTGD6fN)
+                                    :id |mmoyoo4KB5
+                                :id |maFuFTfnB
+                            :id |v6XbojZ7T
+                        :id |n7fDkiHlRW
+                    :id |gRd12G8yH
+                :id |p5aBTUIuhE
+              |x $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475836232)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475837536) (:text |testing) (:id |a7aWO16jileaf)
+                  |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475845590) (:text "|\"get nil") (:id |a4B-yo825c)
+                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475846043)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475846371) (:text |is) (:id |NFgdxHe1RD)
+                      |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475846813)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475846717) (:text |=) (:id |r46ZzEtL_n)
+                          |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475849164) (:text |nil) (:id |mCwkD-8iD)
+                          |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475851333)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475853384) (:text |get-min-key) (:id |glhF_utX0)
+                              |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475854868)
+                                :data $ {}
+                                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475855223) (:text |{}) (:id |GT6wqmJYm7)
+                                :id |HUdtaIiqoJ
+                            :id |wxCKUZKSS
+                        :id |ZWMj2E_rPl
+                    :id |TqnDyM0vZ6
+                  |v $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475846043)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475846371) (:text |is) (:id |NFgdxHe1RD)
+                      |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475846813)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475846717) (:text |=) (:id |r46ZzEtL_n)
+                          |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475849164) (:text |nil) (:id |mCwkD-8iD)
+                          |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475851333)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475858785) (:text |get-max-key) (:id |glhF_utX0)
+                              |j $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475854868)
+                                :data $ {}
+                                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475855223) (:text |{}) (:id |GT6wqmJYm7)
+                                :id |HUdtaIiqoJ
+                            :id |wxCKUZKSS
+                        :id |ZWMj2E_rPl
+                    :id |5DNzEKN9pF
+                :id |a7aWO16ji
+            :id |Dte4rLqFtX
           |test-shorten $ {} (:type :expr) (:by |root) (:at 1518602679684) (:id |rJlgTtKbwG)
             :data $ {}
               |T $ {} (:type :leaf) (:by |root) (:at 1518602743294) (:text |deftest) (:id |H1WgTtFWwf)
@@ -1286,34 +1399,6 @@
                         |v $ {} (:type :leaf) (:by |root) (:at 1514652010514) (:text |min-id) (:id |Hy4ZuZHHQM)
                         |x $ {} (:type :leaf) (:by |root) (:at 1514652012295) (:text |bisect) (:id |Hk7_-SrQM)
         :defs $ {}
-          |assoc-after $ {} (:type :expr) (:by |root) (:at 1514652745250) (:id |H1gbINHH7f)
-            :data $ {}
-              |T $ {} (:type :leaf) (:by |root) (:at 1514652745250) (:text |defn) (:id |B1WW8ErSXf)
-              |j $ {} (:type :leaf) (:by |root) (:at 1514652745250) (:text |assoc-after) (:id |ByMWIVSSXG)
-              |r $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |rJXJ7EBr7f)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514652702835) (:text |dict) (:id |SkeVQEHBQG)
-                  |j $ {} (:type :leaf) (:by |root) (:at 1514652705777) (:text |base-key) (:id |SydQVBSQG)
-                  |r $ {} (:type :leaf) (:by |root) (:at 1514652731993) (:text |v) (:id |BJxGB4SH7G)
-              |v $ {} (:type :expr) (:by |root) (:at 1514652707161) (:id |B1iQVHS7f)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514652708054) (:text |let) (:id |B1iQVHS7fleaf)
-                  |j $ {} (:type :expr) (:by |root) (:at 1514652708284) (:id |Hy72QVHBQG)
-                    :data $ {}
-                      |T $ {} (:type :expr) (:by |root) (:at 1514652708426) (:id |BJ43Q4rBmM)
-                        :data $ {}
-                          |T $ {} (:type :leaf) (:by |root) (:at 1514652711856) (:text |new-key) (:id |BkfnmVrSXM)
-                          |j $ {} (:type :expr) (:by |root) (:at 1514652713021) (:id |HJgZVNSr7M)
-                            :data $ {}
-                              |T $ {} (:type :leaf) (:by |root) (:at 1514652756071) (:text |key-after) (:id |H1W4EHHmz)
-                              |r $ {} (:type :leaf) (:by |root) (:at 1514652722947) (:text |dict) (:id |B1X5EVrSQz)
-                              |v $ {} (:type :leaf) (:by |root) (:at 1514652978496) (:text |base-key) (:id |r1e9NrBHXG)
-                  |r $ {} (:type :expr) (:by |root) (:at 1514652725071) (:id |H1bpNESH7G)
-                    :data $ {}
-                      |T $ {} (:type :leaf) (:by |root) (:at 1514652725866) (:text |assoc) (:id |H1bpNESH7Gleaf)
-                      |b $ {} (:type :leaf) (:by |root) (:at 1514652728233) (:text |dict) (:id |B17kr4HBQM)
-                      |j $ {} (:type :leaf) (:by |root) (:at 1514652726942) (:text |new-key) (:id |H1f04NSHXG)
-                      |r $ {} (:type :leaf) (:by |root) (:at 1514652733100) (:text |v) (:id |r1erHVHSQf)
           |assoc-append $ {} (:type :expr) (:by |root) (:at 1514691370581) (:id |r1eQNjAB7z)
             :data $ {}
               |T $ {} (:type :leaf) (:by |root) (:at 1514691370581) (:text |defn) (:id |SJbmVjASXf)
@@ -1348,68 +1433,6 @@
                       |j $ {} (:type :leaf) (:by |root) (:at 1514691425125) (:text |dict) (:id |ryMuPoAHQz)
                       |r $ {} (:type :leaf) (:by |root) (:at 1514691425442) (:text |k) (:id |r17FPsCHQM)
                       |v $ {} (:type :leaf) (:by |root) (:at 1514691426680) (:text |v) (:id |Bk9PsCr7M)
-          |assoc-before $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |BJgk7NrHQz)
-            :data $ {}
-              |T $ {} (:type :leaf) (:by |root) (:at 1514652695166) (:text |defn) (:id |Hkbk7VHSXf)
-              |j $ {} (:type :leaf) (:by |root) (:at 1514652695166) (:text |assoc-before) (:id |SJG174rH7z)
-              |r $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |rJXJ7EBr7f)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514652702835) (:text |dict) (:id |SkeVQEHBQG)
-                  |j $ {} (:type :leaf) (:by |root) (:at 1514652705777) (:text |base-key) (:id |SydQVBSQG)
-                  |r $ {} (:type :leaf) (:by |root) (:at 1514652731993) (:text |v) (:id |BJxGB4SH7G)
-              |v $ {} (:type :expr) (:by |root) (:at 1514652707161) (:id |B1iQVHS7f)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514652708054) (:text |let) (:id |B1iQVHS7fleaf)
-                  |j $ {} (:type :expr) (:by |root) (:at 1514652708284) (:id |Hy72QVHBQG)
-                    :data $ {}
-                      |T $ {} (:type :expr) (:by |root) (:at 1514652708426) (:id |BJ43Q4rBmM)
-                        :data $ {}
-                          |T $ {} (:type :leaf) (:by |root) (:at 1514652711856) (:text |new-key) (:id |BkfnmVrSXM)
-                          |j $ {} (:type :expr) (:by |root) (:at 1514652713021) (:id |HJgZVNSr7M)
-                            :data $ {}
-                              |T $ {} (:type :leaf) (:by |root) (:at 1514652719436) (:text |key-before) (:id |H1W4EHHmz)
-                              |b $ {} (:type :leaf) (:by |root) (:at 1514652964526) (:text |dict) (:id |H1WhXSSrQz)
-                              |j $ {} (:type :leaf) (:by |root) (:at 1514652722000) (:text |base-key) (:id |B1FNVrB7G)
-                  |r $ {} (:type :expr) (:by |root) (:at 1514652725071) (:id |H1bpNESH7G)
-                    :data $ {}
-                      |T $ {} (:type :leaf) (:by |root) (:at 1514652725866) (:text |assoc) (:id |H1bpNESH7Gleaf)
-                      |b $ {} (:type :leaf) (:by |root) (:at 1514652728233) (:text |dict) (:id |B17kr4HBQM)
-                      |j $ {} (:type :leaf) (:by |root) (:at 1514652726942) (:text |new-key) (:id |H1f04NSHXG)
-                      |r $ {} (:type :leaf) (:by |root) (:at 1514652733100) (:text |v) (:id |r1erHVHSQf)
-          |assoc-prepend $ {} (:type :expr) (:by |root) (:at 1514691381239) (:id |rJgaNj0r7z)
-            :data $ {}
-              |T $ {} (:type :leaf) (:by |root) (:at 1514691381239) (:text |defn) (:id |H1bTNsRrmG)
-              |j $ {} (:type :leaf) (:by |root) (:at 1514691381239) (:text |assoc-prepend) (:id |SkzTNoCrmG)
-              |r $ {} (:type :expr) (:by |root) (:at 1514691370581) (:id |Bk7QNiRrXf)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514691386114) (:text |dict) (:id |Sk-Bj0BmM)
-                  |j $ {} (:type :leaf) (:by |root) (:at 1514691386513) (:text |v) (:id |ByeMHsRSmM)
-              |v $ {} (:type :expr) (:by |root) (:at 1514691387650) (:id |S1NroRHXM)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514691393599) (:text |assert) (:id |S1NroRHXMleaf)
-                  |j $ {} (:type :expr) (:by |root) (:at 1514691393944) (:id |SyZ9rs0rXf)
-                    :data $ {}
-                      |T $ {} (:type :leaf) (:by |root) (:at 1514691394682) (:text |map?) (:id |rJgcriAH7M)
-                      |j $ {} (:type :leaf) (:by |root) (:at 1514691395584) (:text |dict) (:id |rJxiBiAB7f)
-                  |r $ {} (:type :leaf) (:by |root) (:at 1514691404794) (:text "||dict should be a map") (:id |SyRBiCrXM)
-              |x $ {} (:type :expr) (:by |root) (:at 1514691407108) (:id |BywLoCSmG)
-                :data $ {}
-                  |T $ {} (:type :leaf) (:by |root) (:at 1514691412692) (:text |let) (:id |BywLoCSmGleaf)
-                  |j $ {} (:type :expr) (:by |root) (:at 1514691412970) (:id |HyMa8jCBQG)
-                    :data $ {}
-                      |T $ {} (:type :expr) (:by |root) (:at 1514691413115) (:id |B1mpUoAr7f)
-                        :data $ {}
-                          |T $ {} (:type :leaf) (:by |root) (:at 1514691414356) (:text |k) (:id |HkWaIiRBmf)
-                          |j $ {} (:type :expr) (:by |root) (:at 1514691414694) (:id |Hkkws0rmz)
-                            :data $ {}
-                              |T $ {} (:type :leaf) (:by |root) (:at 1514691451143) (:text |key-prepend) (:id |Bk70LiRS7G)
-                              |j $ {} (:type :leaf) (:by |root) (:at 1514691421903) (:text |dict) (:id |SJ-rPoCSXM)
-                  |r $ {} (:type :expr) (:by |root) (:at 1514691423144) (:id |rJePDs0SQf)
-                    :data $ {}
-                      |T $ {} (:type :leaf) (:by |root) (:at 1514691423901) (:text |assoc) (:id |rJePDs0SQfleaf)
-                      |j $ {} (:type :leaf) (:by |root) (:at 1514691425125) (:text |dict) (:id |ryMuPoAHQz)
-                      |r $ {} (:type :leaf) (:by |root) (:at 1514691425442) (:text |k) (:id |r17FPsCHQM)
-                      |v $ {} (:type :leaf) (:by |root) (:at 1514691426680) (:text |v) (:id |Bk9PsCr7M)
           |key-after $ {} (:type :expr) (:by |root) (:at 1514649716043) (:id |Byx3uuEHXG)
             :data $ {}
               |T $ {} (:type :leaf) (:by |root) (:at 1514649716043) (:text |defn) (:id |S1b3duNSQG)
@@ -1508,14 +1531,52 @@
                                     :data $ {}
                                       |T $ {} (:type :leaf) (:by |root) (:at 1514652342032) (:text |inc) (:id |B1ahfrHmG)
                                       |j $ {} (:type :leaf) (:by |root) (:at 1514652505126) (:text |position) (:id |ByQAnzrBXM)
-          |key-append $ {} (:type :expr) (:by |root) (:at 1514691009323) (:id |ByeKatCBQG)
+          |get-min-key $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475686698)
             :data $ {}
-              |T $ {} (:type :leaf) (:by |root) (:at 1514691009323) (:text |defn) (:id |HJ-tTK0rXf)
-              |j $ {} (:type :leaf) (:by |root) (:at 1514691009323) (:text |key-append) (:id |ByztatRBQG)
+              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475686698) (:text |defn) (:id |31F1RuhZ5z)
+              |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475686698) (:text |get-min-key) (:id |bz-kWHCCpo)
+              |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475686698)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475692943) (:text |x) (:id |_aW8KV9AjG)
+                :id |ibCyMMUwe7
+              |v $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475693410)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475696212) (:text |apply) (:id |3-aop2TdoMleaf)
+                  |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475696727) (:text |min) (:id |nBqK7FZJoD)
+                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475697650)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475698315) (:text |keys) (:id |YhgCkGW_K)
+                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475698848) (:text |x) (:id |WOwzn-6dq0)
+                    :id |WscddTGIJc
+                :id |3-aop2TdoM
+            :id |R4g-_JorFV
+          |get-max-key $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475705680)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475705680) (:text |defn) (:id |THFAG3LCtV)
+              |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475705680) (:text |get-max-key) (:id |TlAOGOI_9L)
+              |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475705680)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475710399) (:text |apply) (:id |fnxNipqqT)
+                  |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475715477) (:text |max) (:id |6UeLtvGsR)
+                  |r $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475715843)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475716807) (:text |keys) (:id |mpDx57JqkT)
+                      |j $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475717496) (:text |x) (:id |1bKiYkcBZ)
+                    :id |GjTA2ZM2e7
+                :id |RtWJ5gJHb-
+              |n $ {} (:type :expr) (:by |Q7nwO-CJS) (:at 1596475711633)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |Q7nwO-CJS) (:at 1596475711924) (:text |x) (:id |QPdxEUaTMf)
+                :id |0CcYyROqiE
+            :id |RfN8-idkKZ
+          |key-prepend $ {} (:type :expr) (:by |root) (:at 1514691005591) (:id |SygUTY0rQz)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |root) (:at 1514691005591) (:text |defn) (:id |r1-8TtCHmf)
+              |j $ {} (:type :leaf) (:by |root) (:at 1514691005591) (:text |key-prepend) (:id |ByfU6Y0H7G)
               |r $ {} (:type :expr) (:by |root) (:at 1514649716043) (:id |Skmhuu4HXz)
                 :data $ {}
                   |D $ {} (:type :leaf) (:by |root) (:at 1514653103503) (:text |dict) (:id |HkzP3BBBmf)
-              |x $ {} (:type :expr) (:by |root) (:at 1514652018729) (:id |B1K9WBrQz)
+              |v $ {} (:type :expr) (:by |root) (:at 1514652018729) (:id |B1K9WBrQz)
                 :data $ {}
                   |T $ {} (:type :leaf) (:by |root) (:at 1514652022576) (:text |assert) (:id |H1oOWHBXzleaf)
                   |j $ {} (:type :expr) (:by |root) (:at 1514652023870) (:id |BklxtWrHQf)
@@ -1523,7 +1584,7 @@
                       |T $ {} (:type :leaf) (:by |root) (:at 1514652523659) (:text |map?) (:id |r1gKZSHmf)
                       |j $ {} (:type :leaf) (:by |root) (:at 1514652051100) (:text |dict) (:id |BkXtWrSQf)
                   |r $ {} (:type :leaf) (:by |root) (:at 1514652057041) (:text "||dict should be a map") (:id |HJWItbSrQG)
-              |xT $ {} (:type :expr) (:by |root) (:at 1514691059063) (:id |r1ilcCH7G)
+              |x $ {} (:type :expr) (:by |root) (:at 1514691059063) (:id |r1ilcCH7G)
                 :data $ {}
                   |T $ {} (:type :leaf) (:by |root) (:at 1514691059492) (:text |if) (:id |r1ilcCH7Gleaf)
                   |j $ {} (:type :expr) (:by |root) (:at 1514691059844) (:id |Skx3e9RBmM)
@@ -1538,10 +1599,10 @@
                         :data $ {}
                           |T $ {} (:type :expr) (:by |root) (:at 1514652113785) (:id |Byx5A-BSQz)
                             :data $ {}
-                              |D $ {} (:type :leaf) (:by |root) (:at 1514691132796) (:text |last-key) (:id |BJ-5C-SSQM)
+                              |D $ {} (:type :leaf) (:by |root) (:at 1514691195839) (:text |first-key) (:id |BJ-5C-SSQM)
                               |T $ {} (:type :expr) (:by |root) (:at 1514652199673) (:id |HJeEzBBmM)
                                 :data $ {}
-                                  |D $ {} (:type :leaf) (:by |root) (:at 1514691144821) (:text |last) (:id |ByelVzHrXM)
+                                  |D $ {} (:type :leaf) (:by |root) (:at 1514691198325) (:text |first) (:id |ByelVzHrXM)
                                   |b $ {} (:type :expr) (:by |root) (:at 1514691149169) (:id |SJlBLqCHQf)
                                     :data $ {}
                                       |D $ {} (:type :leaf) (:by |root) (:at 1514691149987) (:text |sort) (:id |Hk-r85CSQG)
@@ -1552,8 +1613,98 @@
                       |v $ {} (:type :expr) (:by |root) (:at 1514652250766) (:id |rylbK7BHQM)
                         :data $ {}
                           |T $ {} (:type :leaf) (:by |root) (:at 1514652291432) (:text |bisect) (:id |HybzwGHB7M)
-                          |j $ {} (:type :leaf) (:by |root) (:at 1514691175400) (:text |last-key) (:id |rk0KGSS7z)
-                          |r $ {} (:type :leaf) (:by |root) (:at 1514691177778) (:text |max-id) (:id |HJed5CS7G)
+                          |b $ {} (:type :leaf) (:by |root) (:at 1514691202476) (:text |min-id) (:id |SyZtt90BQf)
+                          |j $ {} (:type :leaf) (:by |root) (:at 1514691215646) (:text |first-key) (:id |rk0KGSS7z)
+          |assoc-after $ {} (:type :expr) (:by |root) (:at 1514652745250) (:id |H1gbINHH7f)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |root) (:at 1514652745250) (:text |defn) (:id |B1WW8ErSXf)
+              |j $ {} (:type :leaf) (:by |root) (:at 1514652745250) (:text |assoc-after) (:id |ByMWIVSSXG)
+              |r $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |rJXJ7EBr7f)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514652702835) (:text |dict) (:id |SkeVQEHBQG)
+                  |j $ {} (:type :leaf) (:by |root) (:at 1514652705777) (:text |base-key) (:id |SydQVBSQG)
+                  |r $ {} (:type :leaf) (:by |root) (:at 1514652731993) (:text |v) (:id |BJxGB4SH7G)
+              |v $ {} (:type :expr) (:by |root) (:at 1514652707161) (:id |B1iQVHS7f)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514652708054) (:text |let) (:id |B1iQVHS7fleaf)
+                  |j $ {} (:type :expr) (:by |root) (:at 1514652708284) (:id |Hy72QVHBQG)
+                    :data $ {}
+                      |T $ {} (:type :expr) (:by |root) (:at 1514652708426) (:id |BJ43Q4rBmM)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |root) (:at 1514652711856) (:text |new-key) (:id |BkfnmVrSXM)
+                          |j $ {} (:type :expr) (:by |root) (:at 1514652713021) (:id |HJgZVNSr7M)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |root) (:at 1514652756071) (:text |key-after) (:id |H1W4EHHmz)
+                              |r $ {} (:type :leaf) (:by |root) (:at 1514652722947) (:text |dict) (:id |B1X5EVrSQz)
+                              |v $ {} (:type :leaf) (:by |root) (:at 1514652978496) (:text |base-key) (:id |r1e9NrBHXG)
+                  |r $ {} (:type :expr) (:by |root) (:at 1514652725071) (:id |H1bpNESH7G)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |root) (:at 1514652725866) (:text |assoc) (:id |H1bpNESH7Gleaf)
+                      |b $ {} (:type :leaf) (:by |root) (:at 1514652728233) (:text |dict) (:id |B17kr4HBQM)
+                      |j $ {} (:type :leaf) (:by |root) (:at 1514652726942) (:text |new-key) (:id |H1f04NSHXG)
+                      |r $ {} (:type :leaf) (:by |root) (:at 1514652733100) (:text |v) (:id |r1erHVHSQf)
+          |assoc-before $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |BJgk7NrHQz)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |root) (:at 1514652695166) (:text |defn) (:id |Hkbk7VHSXf)
+              |j $ {} (:type :leaf) (:by |root) (:at 1514652695166) (:text |assoc-before) (:id |SJG174rH7z)
+              |r $ {} (:type :expr) (:by |root) (:at 1514652695166) (:id |rJXJ7EBr7f)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514652702835) (:text |dict) (:id |SkeVQEHBQG)
+                  |j $ {} (:type :leaf) (:by |root) (:at 1514652705777) (:text |base-key) (:id |SydQVBSQG)
+                  |r $ {} (:type :leaf) (:by |root) (:at 1514652731993) (:text |v) (:id |BJxGB4SH7G)
+              |v $ {} (:type :expr) (:by |root) (:at 1514652707161) (:id |B1iQVHS7f)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514652708054) (:text |let) (:id |B1iQVHS7fleaf)
+                  |j $ {} (:type :expr) (:by |root) (:at 1514652708284) (:id |Hy72QVHBQG)
+                    :data $ {}
+                      |T $ {} (:type :expr) (:by |root) (:at 1514652708426) (:id |BJ43Q4rBmM)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |root) (:at 1514652711856) (:text |new-key) (:id |BkfnmVrSXM)
+                          |j $ {} (:type :expr) (:by |root) (:at 1514652713021) (:id |HJgZVNSr7M)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |root) (:at 1514652719436) (:text |key-before) (:id |H1W4EHHmz)
+                              |b $ {} (:type :leaf) (:by |root) (:at 1514652964526) (:text |dict) (:id |H1WhXSSrQz)
+                              |j $ {} (:type :leaf) (:by |root) (:at 1514652722000) (:text |base-key) (:id |B1FNVrB7G)
+                  |r $ {} (:type :expr) (:by |root) (:at 1514652725071) (:id |H1bpNESH7G)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |root) (:at 1514652725866) (:text |assoc) (:id |H1bpNESH7Gleaf)
+                      |b $ {} (:type :leaf) (:by |root) (:at 1514652728233) (:text |dict) (:id |B17kr4HBQM)
+                      |j $ {} (:type :leaf) (:by |root) (:at 1514652726942) (:text |new-key) (:id |H1f04NSHXG)
+                      |r $ {} (:type :leaf) (:by |root) (:at 1514652733100) (:text |v) (:id |r1erHVHSQf)
+          |assoc-prepend $ {} (:type :expr) (:by |root) (:at 1514691381239) (:id |rJgaNj0r7z)
+            :data $ {}
+              |T $ {} (:type :leaf) (:by |root) (:at 1514691381239) (:text |defn) (:id |H1bTNsRrmG)
+              |j $ {} (:type :leaf) (:by |root) (:at 1514691381239) (:text |assoc-prepend) (:id |SkzTNoCrmG)
+              |r $ {} (:type :expr) (:by |root) (:at 1514691370581) (:id |Bk7QNiRrXf)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514691386114) (:text |dict) (:id |Sk-Bj0BmM)
+                  |j $ {} (:type :leaf) (:by |root) (:at 1514691386513) (:text |v) (:id |ByeMHsRSmM)
+              |v $ {} (:type :expr) (:by |root) (:at 1514691387650) (:id |S1NroRHXM)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514691393599) (:text |assert) (:id |S1NroRHXMleaf)
+                  |j $ {} (:type :expr) (:by |root) (:at 1514691393944) (:id |SyZ9rs0rXf)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |root) (:at 1514691394682) (:text |map?) (:id |rJgcriAH7M)
+                      |j $ {} (:type :leaf) (:by |root) (:at 1514691395584) (:text |dict) (:id |rJxiBiAB7f)
+                  |r $ {} (:type :leaf) (:by |root) (:at 1514691404794) (:text "||dict should be a map") (:id |SyRBiCrXM)
+              |x $ {} (:type :expr) (:by |root) (:at 1514691407108) (:id |BywLoCSmG)
+                :data $ {}
+                  |T $ {} (:type :leaf) (:by |root) (:at 1514691412692) (:text |let) (:id |BywLoCSmGleaf)
+                  |j $ {} (:type :expr) (:by |root) (:at 1514691412970) (:id |HyMa8jCBQG)
+                    :data $ {}
+                      |T $ {} (:type :expr) (:by |root) (:at 1514691413115) (:id |B1mpUoAr7f)
+                        :data $ {}
+                          |T $ {} (:type :leaf) (:by |root) (:at 1514691414356) (:text |k) (:id |HkWaIiRBmf)
+                          |j $ {} (:type :expr) (:by |root) (:at 1514691414694) (:id |Hkkws0rmz)
+                            :data $ {}
+                              |T $ {} (:type :leaf) (:by |root) (:at 1514691451143) (:text |key-prepend) (:id |Bk70LiRS7G)
+                              |j $ {} (:type :leaf) (:by |root) (:at 1514691421903) (:text |dict) (:id |SJ-rPoCSXM)
+                  |r $ {} (:type :expr) (:by |root) (:at 1514691423144) (:id |rJePDs0SQf)
+                    :data $ {}
+                      |T $ {} (:type :leaf) (:by |root) (:at 1514691423901) (:text |assoc) (:id |rJePDs0SQfleaf)
+                      |j $ {} (:type :leaf) (:by |root) (:at 1514691425125) (:text |dict) (:id |ryMuPoAHQz)
+                      |r $ {} (:type :leaf) (:by |root) (:at 1514691425442) (:text |k) (:id |r17FPsCHQM)
+                      |v $ {} (:type :leaf) (:by |root) (:at 1514691426680) (:text |v) (:id |Bk9PsCr7M)
           |key-before $ {} (:type :expr) (:by |root) (:at 1514649713289) (:id |r1ltO_ESQz)
             :data $ {}
               |T $ {} (:type :leaf) (:by |root) (:at 1514649713289) (:text |defn) (:id |S1WYOu4SXf)
@@ -1645,14 +1796,14 @@
                                       |T $ {} (:type :leaf) (:by |root) (:at 1514652403389) (:text |dec) (:id |B1ahfrHmG)
                                       |j $ {} (:type :leaf) (:by |root) (:at 1514652508559) (:text |position) (:id |ByQAnzrBXM)
                           |v $ {} (:type :leaf) (:by |root) (:at 1514652369395) (:text |base-key) (:id |H1eYRzSSQz)
-          |key-prepend $ {} (:type :expr) (:by |root) (:at 1514691005591) (:id |SygUTY0rQz)
+          |key-append $ {} (:type :expr) (:by |root) (:at 1514691009323) (:id |ByeKatCBQG)
             :data $ {}
-              |T $ {} (:type :leaf) (:by |root) (:at 1514691005591) (:text |defn) (:id |r1-8TtCHmf)
-              |j $ {} (:type :leaf) (:by |root) (:at 1514691005591) (:text |key-prepend) (:id |ByfU6Y0H7G)
+              |T $ {} (:type :leaf) (:by |root) (:at 1514691009323) (:text |defn) (:id |HJ-tTK0rXf)
+              |j $ {} (:type :leaf) (:by |root) (:at 1514691009323) (:text |key-append) (:id |ByztatRBQG)
               |r $ {} (:type :expr) (:by |root) (:at 1514649716043) (:id |Skmhuu4HXz)
                 :data $ {}
                   |D $ {} (:type :leaf) (:by |root) (:at 1514653103503) (:text |dict) (:id |HkzP3BBBmf)
-              |v $ {} (:type :expr) (:by |root) (:at 1514652018729) (:id |B1K9WBrQz)
+              |x $ {} (:type :expr) (:by |root) (:at 1514652018729) (:id |B1K9WBrQz)
                 :data $ {}
                   |T $ {} (:type :leaf) (:by |root) (:at 1514652022576) (:text |assert) (:id |H1oOWHBXzleaf)
                   |j $ {} (:type :expr) (:by |root) (:at 1514652023870) (:id |BklxtWrHQf)
@@ -1660,7 +1811,7 @@
                       |T $ {} (:type :leaf) (:by |root) (:at 1514652523659) (:text |map?) (:id |r1gKZSHmf)
                       |j $ {} (:type :leaf) (:by |root) (:at 1514652051100) (:text |dict) (:id |BkXtWrSQf)
                   |r $ {} (:type :leaf) (:by |root) (:at 1514652057041) (:text "||dict should be a map") (:id |HJWItbSrQG)
-              |x $ {} (:type :expr) (:by |root) (:at 1514691059063) (:id |r1ilcCH7G)
+              |xT $ {} (:type :expr) (:by |root) (:at 1514691059063) (:id |r1ilcCH7G)
                 :data $ {}
                   |T $ {} (:type :leaf) (:by |root) (:at 1514691059492) (:text |if) (:id |r1ilcCH7Gleaf)
                   |j $ {} (:type :expr) (:by |root) (:at 1514691059844) (:id |Skx3e9RBmM)
@@ -1675,10 +1826,10 @@
                         :data $ {}
                           |T $ {} (:type :expr) (:by |root) (:at 1514652113785) (:id |Byx5A-BSQz)
                             :data $ {}
-                              |D $ {} (:type :leaf) (:by |root) (:at 1514691195839) (:text |first-key) (:id |BJ-5C-SSQM)
+                              |D $ {} (:type :leaf) (:by |root) (:at 1514691132796) (:text |last-key) (:id |BJ-5C-SSQM)
                               |T $ {} (:type :expr) (:by |root) (:at 1514652199673) (:id |HJeEzBBmM)
                                 :data $ {}
-                                  |D $ {} (:type :leaf) (:by |root) (:at 1514691198325) (:text |first) (:id |ByelVzHrXM)
+                                  |D $ {} (:type :leaf) (:by |root) (:at 1514691144821) (:text |last) (:id |ByelVzHrXM)
                                   |b $ {} (:type :expr) (:by |root) (:at 1514691149169) (:id |SJlBLqCHQf)
                                     :data $ {}
                                       |D $ {} (:type :leaf) (:by |root) (:at 1514691149987) (:text |sort) (:id |Hk-r85CSQG)
@@ -1689,12 +1840,7 @@
                       |v $ {} (:type :expr) (:by |root) (:at 1514652250766) (:id |rylbK7BHQM)
                         :data $ {}
                           |T $ {} (:type :leaf) (:by |root) (:at 1514652291432) (:text |bisect) (:id |HybzwGHB7M)
-                          |b $ {} (:type :leaf) (:by |root) (:at 1514691202476) (:text |min-id) (:id |SyZtt90BQf)
-                          |j $ {} (:type :leaf) (:by |root) (:at 1514691215646) (:text |first-key) (:id |rk0KGSS7z)
+                          |j $ {} (:type :leaf) (:by |root) (:at 1514691175400) (:text |last-key) (:id |rk0KGSS7z)
+                          |r $ {} (:type :leaf) (:by |root) (:at 1514691177778) (:text |max-id) (:id |HJed5CS7G)
         :proc $ {} (:type :expr) (:by |root) (:at 1514649702582) (:id |r1XyOuVrXf) (:data $ {})
-  :sessions $ {}
-  :users $ {}
-    |root $ {} (:id |root) (:name |root) (:nickname |root) (:password |d41d8cd98f00b204e9800998ecf8427e) (:avatar nil) (:theme :star-trail)
-  :saved-files $ {}
   :configs $ {} (:storage-key |calcit.cirru) (:extension |.cljs) (:output |src) (:port 6001)
-  :repl $ {} (:alive? false) (:logs $ {})
diff --git a/deps.edn b/deps.edn
index 2e5b93e..c296ec1 100644
--- a/deps.edn
+++ b/deps.edn
@@ -4,9 +4,9 @@
   :aliases {
     :release {
       :extra-deps {
-        appliedscience/deps-library {:mvn/version "0.3.4"}
+        applied-science/deps-library {:mvn/version "0.4.0"}
       }
-      :main-opts ["-m" "deps-library.release"]
+      :main-opts ["-m" "applied-science.deps-library"]
     }
   }
 }
diff --git a/package.json b/package.json
index 36bb101..de6e32c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bisection-key",
-  "version": "0.1.5",
+  "version": "0.1.6-a1",
   "description": "Bisection key library",
   "main": "index.js",
   "scripts": {
@@ -18,9 +18,9 @@
   "author": "jiyinyiyong",
   "license": "MIT",
   "devDependencies": {
-    "shadow-cljs": "^2.8.94",
-    "source-map-loader": "^0.2.4",
-    "ws": "^7.2.3"
+    "shadow-cljs": "^2.10.19",
+    "source-map-loader": "^1.0.1",
+    "ws": "^7.3.1"
   },
   "dependencies": {}
 }
diff --git a/release.edn b/release.edn
index 7c1b22d..b3b04fa 100644
--- a/release.edn
+++ b/release.edn
@@ -1,4 +1,4 @@
-{:version "0.1.5"
+{:version "0.1.6-a1"
  :group-id "cirru"
  :artifact-id "bisection-key"
  :skip-tag true
diff --git a/src/bisection_key/test.cljs b/src/bisection_key/test.cljs
index 15b8b38..f53c338 100644
--- a/src/bisection_key/test.cljs
+++ b/src/bisection_key/test.cljs
@@ -11,7 +11,9 @@
               key-prepend
               key-append
               assoc-prepend
-              assoc-append]]))
+              assoc-append
+              get-min-key
+              get-max-key]]))
 
 (deftest
  test-append
@@ -51,6 +53,12 @@
      (let [new-id (bisect min-id x)] (if (<= i 40) (recur (inc i) new-id) x)))
    "++++++/")))
 
+(deftest
+ test-get-key
+ (testing "get min key" (is (= "a" (get-min-key {"a" 1, "b" 2}))))
+ (testing "get max key" (is (= "b" (get-max-key {"a" 1, "b" 2}))))
+ (testing "get nil" (is (= nil (get-min-key {}))) (is (= nil (get-max-key {})))))
+
 (deftest
  test-key-after
  (is (= (key-after {"a" 1, "b" 1} "a") "aT"))
diff --git a/src/bisection_key/util.cljs b/src/bisection_key/util.cljs
index 66e3d3d..dffee1e 100644
--- a/src/bisection_key/util.cljs
+++ b/src/bisection_key/util.cljs
@@ -46,3 +46,7 @@
 (defn assoc-prepend [dict v]
   (assert (map? dict) "dict should be a map")
   (let [k (key-prepend dict)] (assoc dict k v)))
+
+(defn get-max-key [x] (apply max (keys x)))
+
+(defn get-min-key [x] (apply min (keys x)))
diff --git a/yarn.lock b/yarn.lock
index 9f7d5c4..a77d790 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,31 @@
 # yarn lockfile v1
 
 
+"@types/json-schema@^7.0.4":
+  version "7.0.5"
+  resolved "https://registry.npm.taobao.org/@types/json-schema/download/@types/json-schema-7.0.5.tgz?cache=0&sync_timestamp=1591721100166&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40types%2Fjson-schema%2Fdownload%2F%40types%2Fjson-schema-7.0.5.tgz#dcce4430e64b443ba8945f0290fb564ad5bac6dd"
+  integrity sha1-3M5EMOZLRDuolF8CkPtWStW6xt0=
+
+abab@^2.0.3:
+  version "2.0.4"
+  resolved "https://registry.npm.taobao.org/abab/download/abab-2.0.4.tgz?cache=0&sync_timestamp=1596257926840&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fabab%2Fdownload%2Fabab-2.0.4.tgz#6dfa57b417ca06d21b2478f0e638302f99c2405c"
+  integrity sha1-bfpXtBfKBtIbJHjw5jgwL5nCQFw=
+
+ajv-keywords@^3.4.1:
+  version "3.5.2"
+  resolved "https://registry.npm.taobao.org/ajv-keywords/download/ajv-keywords-3.5.2.tgz?cache=0&sync_timestamp=1595907089917&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fajv-keywords%2Fdownload%2Fajv-keywords-3.5.2.tgz#31f29da5ab6e00d1c2d329acf7b5929614d5014d"
+  integrity sha1-MfKdpatuANHC0yms97WSlhTVAU0=
+
+ajv@^6.12.2:
+  version "6.12.3"
+  resolved "https://registry.npm.taobao.org/ajv/download/ajv-6.12.3.tgz?cache=0&sync_timestamp=1593877011158&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fajv%2Fdownload%2Fajv-6.12.3.tgz#18c5af38a111ddeb4f2697bd78d68abc1cabd706"
+  integrity sha1-GMWvOKER3etPJpe9eNaKvByr1wY=
+  dependencies:
+    fast-deep-equal "^3.1.1"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.4.1"
+    uri-js "^4.2.2"
+
 asn1.js@^4.0.0:
   version "4.10.1"
   resolved "https://registry.npm.taobao.org/asn1.js/download/asn1.js-4.10.1.tgz#b9c2bf5805f1e64aadeed6df3a2bfafb5a73f5a0"
@@ -21,16 +46,9 @@ assert@^1.1.1:
 
 async-limiter@~1.0.0:
   version "1.0.1"
-  resolved "https://registry.npm.taobao.org/async-limiter/download/async-limiter-1.0.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fasync-limiter%2Fdownload%2Fasync-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
+  resolved "https://registry.npm.taobao.org/async-limiter/download/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
   integrity sha1-3TeelPDbgxCwgpH51kwyCXZmF/0=
 
-async@^2.5.0:
-  version "2.6.3"
-  resolved "https://registry.npm.taobao.org/async/download/async-2.6.3.tgz?cache=0&sync_timestamp=1582540512270&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fasync%2Fdownload%2Fasync-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
-  integrity sha1-1yYl4jRKNlbjo61Pp0n6gymdgv8=
-  dependencies:
-    lodash "^4.17.14"
-
 base64-js@^1.0.2:
   version "1.3.1"
   resolved "https://registry.npm.taobao.org/base64-js/download/base64-js-1.3.1.tgz#58ece8cb75dd07e71ed08c736abc5fac4dbf8df1"
@@ -41,14 +59,19 @@ big.js@^5.2.2:
   resolved "https://registry.npm.taobao.org/big.js/download/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
   integrity sha1-ZfCvOC9Xi83HQr2cKB6cstd2gyg=
 
-bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.4.0:
+bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.4.0:
   version "4.11.9"
-  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.11.9.tgz#26d556829458f9d1e81fc48952493d0ba3507828"
-  integrity sha512-E6QoYqCKZfgatHTdHzs1RRKP7ip4vvm+EyRUeE2RF0NblwVvb0p6jSVeNTOFxPn26QXN2o6SMfNxKp6kU8zQaw==
+  resolved "https://registry.npm.taobao.org/bn.js/download/bn.js-4.11.9.tgz#26d556829458f9d1e81fc48952493d0ba3507828"
+  integrity sha1-JtVWgpRY+dHoH8SJUkk9C6NQeCg=
+
+bn.js@^5.1.1:
+  version "5.1.2"
+  resolved "https://registry.npm.taobao.org/bn.js/download/bn.js-5.1.2.tgz#c9686902d3c9a27729f43ab10f9d79c2004da7b0"
+  integrity sha1-yWhpAtPJoncp9DqxD515wgBNp7A=
 
 brorand@^1.0.1:
   version "1.1.0"
-  resolved "https://registry.yarnpkg.com/brorand/-/brorand-1.1.0.tgz#12c25efe40a45e3c323eb8675a0a0ce57b22371f"
+  resolved "https://registry.npm.taobao.org/brorand/download/brorand-1.1.0.tgz#12c25efe40a45e3c323eb8675a0a0ce57b22371f"
   integrity sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=
 
 browserify-aes@^1.0.0, browserify-aes@^1.0.4:
@@ -82,7 +105,7 @@ browserify-des@^1.0.0:
     inherits "^2.0.1"
     safe-buffer "^5.1.2"
 
-browserify-rsa@^4.0.0:
+browserify-rsa@^4.0.0, browserify-rsa@^4.0.1:
   version "4.0.1"
   resolved "https://registry.npm.taobao.org/browserify-rsa/download/browserify-rsa-4.0.1.tgz#21e0abfaf6f2029cf2fafb133567a701d4135524"
   integrity sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=
@@ -91,17 +114,19 @@ browserify-rsa@^4.0.0:
     randombytes "^2.0.1"
 
 browserify-sign@^4.0.0:
-  version "4.0.4"
-  resolved "https://registry.npm.taobao.org/browserify-sign/download/browserify-sign-4.0.4.tgz#aa4eb68e5d7b658baa6bf6a57e630cbd7a93d298"
-  integrity sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=
-  dependencies:
-    bn.js "^4.1.1"
-    browserify-rsa "^4.0.0"
-    create-hash "^1.1.0"
-    create-hmac "^1.1.2"
-    elliptic "^6.0.0"
-    inherits "^2.0.1"
-    parse-asn1 "^5.0.0"
+  version "4.2.0"
+  resolved "https://registry.npm.taobao.org/browserify-sign/download/browserify-sign-4.2.0.tgz#545d0b1b07e6b2c99211082bf1b12cce7a0b0e11"
+  integrity sha1-VF0LGwfmssmSEQgr8bEsznoLDhE=
+  dependencies:
+    bn.js "^5.1.1"
+    browserify-rsa "^4.0.1"
+    create-hash "^1.2.0"
+    create-hmac "^1.1.7"
+    elliptic "^6.5.2"
+    inherits "^2.0.4"
+    parse-asn1 "^5.1.5"
+    readable-stream "^3.6.0"
+    safe-buffer "^5.2.0"
 
 browserify-zlib@^0.2.0:
   version "0.2.0"
@@ -160,7 +185,7 @@ create-ecdh@^4.0.0:
     bn.js "^4.1.0"
     elliptic "^6.0.0"
 
-create-hash@^1.1.0, create-hash@^1.1.2:
+create-hash@^1.1.0, create-hash@^1.1.2, create-hash@^1.2.0:
   version "1.2.0"
   resolved "https://registry.npm.taobao.org/create-hash/download/create-hash-1.2.0.tgz#889078af11a63756bcfb59bd221996be3a9ef196"
   integrity sha1-iJB4rxGmN1a8+1m9IhmWvjqe8ZY=
@@ -171,7 +196,7 @@ create-hash@^1.1.0, create-hash@^1.1.2:
     ripemd160 "^2.0.1"
     sha.js "^2.4.0"
 
-create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4:
+create-hmac@^1.1.0, create-hmac@^1.1.4, create-hmac@^1.1.7:
   version "1.1.7"
   resolved "https://registry.npm.taobao.org/create-hmac/download/create-hmac-1.1.7.tgz#69170c78b3ab957147b2b8b04572e47ead2243ff"
   integrity sha1-aRcMeLOrlXFHsriwRXLkfq0iQ/8=
@@ -200,6 +225,15 @@ crypto-browserify@^3.11.0:
     randombytes "^2.0.0"
     randomfill "^1.0.3"
 
+data-urls@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.npm.taobao.org/data-urls/download/data-urls-2.0.0.tgz#156485a72963a970f5d5821aaf642bef2bf2db9b"
+  integrity sha1-FWSFpyljqXD11YIar2Qr7yvy25s=
+  dependencies:
+    abab "^2.0.3"
+    whatwg-mimetype "^2.3.0"
+    whatwg-url "^8.0.0"
+
 des.js@^1.0.0:
   version "1.0.1"
   resolved "https://registry.npm.taobao.org/des.js/download/des.js-1.0.1.tgz#5382142e1bdc53f85d86d53e5f4aa7deb91e0843"
@@ -219,13 +253,13 @@ diffie-hellman@^5.0.0:
 
 domain-browser@^1.1.1:
   version "1.2.0"
-  resolved "https://registry.npm.taobao.org/domain-browser/download/domain-browser-1.2.0.tgz#3d31f50191a6749dd1375a7f522e823d42e54eda"
+  resolved "https://registry.npm.taobao.org/domain-browser/download/domain-browser-1.2.0.tgz?cache=0&sync_timestamp=1595352506617&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fdomain-browser%2Fdownload%2Fdomain-browser-1.2.0.tgz#3d31f50191a6749dd1375a7f522e823d42e54eda"
   integrity sha1-PTH1AZGmdJ3RN1p/Ui6CPULlTto=
 
-elliptic@^6.0.0:
+elliptic@^6.0.0, elliptic@^6.5.2:
   version "6.5.3"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.3.tgz#cb59eb2efdaf73a0bd78ccd7015a62ad6e0f93d6"
-  integrity sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==
+  resolved "https://registry.npm.taobao.org/elliptic/download/elliptic-6.5.3.tgz?cache=0&sync_timestamp=1592492734974&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Felliptic%2Fdownload%2Felliptic-6.5.3.tgz#cb59eb2efdaf73a0bd78ccd7015a62ad6e0f93d6"
+  integrity sha1-y1nrLv2vc6C9eMzXAVpirW4Pk9Y=
   dependencies:
     bn.js "^4.4.0"
     brorand "^1.0.1"
@@ -241,9 +275,9 @@ emojis-list@^3.0.0:
   integrity sha1-VXBmIEatKeLpFucariYKvf9Pang=
 
 events@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.npm.taobao.org/events/download/events-3.1.0.tgz#84279af1b34cb75aa88bf5ff291f6d0bd9b31a59"
-  integrity sha1-hCea8bNMt1qoi/X/KR9tC9mzGlk=
+  version "3.2.0"
+  resolved "https://registry.npm.taobao.org/events/download/events-3.2.0.tgz?cache=0&sync_timestamp=1595422651095&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fevents%2Fdownload%2Fevents-3.2.0.tgz#93b87c18f8efcd4202a461aec4dfc0556b639379"
+  integrity sha1-k7h8GPjvzUICpGGuxN/AVWtjk3k=
 
 evp_bytestokey@^1.0.0, evp_bytestokey@^1.0.3:
   version "1.0.3"
@@ -253,25 +287,36 @@ evp_bytestokey@^1.0.0, evp_bytestokey@^1.0.3:
     md5.js "^1.3.4"
     safe-buffer "^5.1.1"
 
+fast-deep-equal@^3.1.1:
+  version "3.1.3"
+  resolved "https://registry.npm.taobao.org/fast-deep-equal/download/fast-deep-equal-3.1.3.tgz?cache=0&sync_timestamp=1591599759937&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ffast-deep-equal%2Fdownload%2Ffast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
+  integrity sha1-On1WtVnWy8PrUSMlJE5hmmXGxSU=
+
+fast-json-stable-stringify@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.npm.taobao.org/fast-json-stable-stringify/download/fast-json-stable-stringify-2.1.0.tgz#874bf69c6f404c2b5d99c481341399fd55892633"
+  integrity sha1-h0v2nG9ATCtdmcSBNBOZ/VWJJjM=
+
 hash-base@^3.0.0:
-  version "3.0.4"
-  resolved "https://registry.npm.taobao.org/hash-base/download/hash-base-3.0.4.tgz#5fc8686847ecd73499403319a6b0a3f3f6ae4918"
-  integrity sha1-X8hoaEfs1zSZQDMZprCj8/auSRg=
+  version "3.1.0"
+  resolved "https://registry.npm.taobao.org/hash-base/download/hash-base-3.1.0.tgz?cache=0&sync_timestamp=1588318012719&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fhash-base%2Fdownload%2Fhash-base-3.1.0.tgz#55c381d9e06e1d2997a883b4a3fddfe7f0d3af33"
+  integrity sha1-VcOB2eBuHSmXqIO0o/3f5/DTrzM=
   dependencies:
-    inherits "^2.0.1"
-    safe-buffer "^5.0.1"
+    inherits "^2.0.4"
+    readable-stream "^3.6.0"
+    safe-buffer "^5.2.0"
 
 hash.js@^1.0.0, hash.js@^1.0.3:
   version "1.1.7"
-  resolved "https://registry.yarnpkg.com/hash.js/-/hash.js-1.1.7.tgz#0babca538e8d4ee4a0f8988d68866537a003cf42"
-  integrity sha512-taOaskGt4z4SOANNseOviYDvjEJinIkRgmp7LbKP2YTTmVxWBl87s/uzK9r+44BclBSp2X7K1hqeNfz9JbBeXA==
+  resolved "https://registry.npm.taobao.org/hash.js/download/hash.js-1.1.7.tgz#0babca538e8d4ee4a0f8988d68866537a003cf42"
+  integrity sha1-C6vKU46NTuSg+JiNaIZlN6ADz0I=
   dependencies:
     inherits "^2.0.3"
     minimalistic-assert "^1.0.1"
 
 hmac-drbg@^1.0.0:
   version "1.0.1"
-  resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
+  resolved "https://registry.npm.taobao.org/hmac-drbg/download/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
   integrity sha1-0nRXAQJabHdabFRXk+1QL8DGSaE=
   dependencies:
     hash.js "^1.0.3"
@@ -283,6 +328,13 @@ https-browserify@^1.0.0:
   resolved "https://registry.npm.taobao.org/https-browserify/download/https-browserify-1.0.0.tgz#ec06c10e0a34c0f2faf199f7fd7fc78fffd03c73"
   integrity sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM=
 
+iconv-lite@^0.5.1:
+  version "0.5.2"
+  resolved "https://registry.npm.taobao.org/iconv-lite/download/iconv-lite-0.5.2.tgz?cache=0&sync_timestamp=1594184297399&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ficonv-lite%2Fdownload%2Ficonv-lite-0.5.2.tgz#af6d628dccfb463b7364d97f715e4b74b8c8c2b8"
+  integrity sha1-r21ijcz7RjtzZNl/cV5LdLjIwrg=
+  dependencies:
+    safer-buffer ">= 2.1.2 < 3"
+
 ieee754@^1.1.4:
   version "1.1.13"
   resolved "https://registry.npm.taobao.org/ieee754/download/ieee754-1.1.13.tgz#ec168558e95aa181fd87d37f55c32bbcb6708b84"
@@ -298,10 +350,10 @@ inherits@2.0.3:
   resolved "https://registry.npm.taobao.org/inherits/download/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
-inherits@^2.0.1, inherits@^2.0.3, inherits@~2.0.1, inherits@~2.0.3:
+inherits@^2.0.1, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.1, inherits@~2.0.3:
   version "2.0.4"
-  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
-  integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
+  resolved "https://registry.npm.taobao.org/inherits/download/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
+  integrity sha1-D6LGT5MpF8NDOg3tVTY6rjdBa3w=
 
 isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
@@ -313,26 +365,31 @@ isexe@^2.0.0:
   resolved "https://registry.npm.taobao.org/isexe/download/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
   integrity sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=
 
-json5@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.npm.taobao.org/json5/download/json5-1.0.1.tgz#779fb0018604fa854eacbf6252180d83543e3dbe"
-  integrity sha1-d5+wAYYE+oVOrL9iUhgNg1Q+Pb4=
+json-schema-traverse@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.npm.taobao.org/json-schema-traverse/download/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
+  integrity sha1-afaofZUTq4u4/mO9sJecRI5oRmA=
+
+json5@^2.1.2:
+  version "2.1.3"
+  resolved "https://registry.npm.taobao.org/json5/download/json5-2.1.3.tgz#c9b0f7fa9233bfe5807fe66fcf3a5617ed597d43"
+  integrity sha1-ybD3+pIzv+WAf+ZvzzpWF+1ZfUM=
   dependencies:
-    minimist "^1.2.0"
+    minimist "^1.2.5"
 
-loader-utils@^1.1.0:
-  version "1.4.0"
-  resolved "https://registry.npm.taobao.org/loader-utils/download/loader-utils-1.4.0.tgz?cache=0&sync_timestamp=1584472515006&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Floader-utils%2Fdownload%2Floader-utils-1.4.0.tgz#c579b5e34cb34b1a74edc6c1fb36bfa371d5a613"
-  integrity sha1-xXm140yzSxp07cbB+za/o3HVphM=
+loader-utils@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.npm.taobao.org/loader-utils/download/loader-utils-2.0.0.tgz?cache=0&sync_timestamp=1584445611428&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Floader-utils%2Fdownload%2Floader-utils-2.0.0.tgz#e4cace5b816d425a166b5f097e10cd12b36064b0"
+  integrity sha1-5MrOW4FtQloWa18JfhDNErNgZLA=
   dependencies:
     big.js "^5.2.2"
     emojis-list "^3.0.0"
-    json5 "^1.0.1"
+    json5 "^2.1.2"
 
-lodash@^4.17.14:
-  version "4.17.19"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
-  integrity sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==
+lodash.sortby@^4.7.0:
+  version "4.7.0"
+  resolved "https://registry.npm.taobao.org/lodash.sortby/download/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
+  integrity sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=
 
 md5.js@^1.3.4:
   version "1.3.5"
@@ -353,15 +410,15 @@ miller-rabin@^4.0.0:
 
 minimalistic-assert@^1.0.0, minimalistic-assert@^1.0.1:
   version "1.0.1"
-  resolved "https://registry.yarnpkg.com/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
-  integrity sha512-UtJcAD4yEaGtjPezWuO9wC4nwUnVH/8/Im3yEHQP4b67cXlD/Qr9hdITCU1xDbSEXg2XKNaP8jsReV7vQd00/A==
+  resolved "https://registry.npm.taobao.org/minimalistic-assert/download/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
+  integrity sha1-LhlN4ERibUoQ5/f7wAznPoPk1cc=
 
 minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
   version "1.0.1"
-  resolved "https://registry.yarnpkg.com/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
+  resolved "https://registry.npm.taobao.org/minimalistic-crypto-utils/download/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
   integrity sha1-9sAMHAsIIkblxNmd+4x8CDsrWCo=
 
-minimist@^1.2.0:
+minimist@^1.2.5:
   version "1.2.5"
   resolved "https://registry.npm.taobao.org/minimist/download/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha1-Z9ZgFLZqaoqqDAg8X9WN9OTpdgI=
@@ -397,7 +454,7 @@ node-libs-browser@^2.0.0:
 
 object-assign@^4.1.1:
   version "4.1.1"
-  resolved "https://registry.npm.taobao.org/object-assign/download/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
+  resolved "https://registry.npm.taobao.org/object-assign/download/object-assign-4.1.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fobject-assign%2Fdownload%2Fobject-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
   integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
 
 os-browserify@^0.3.0:
@@ -407,10 +464,10 @@ os-browserify@^0.3.0:
 
 pako@~1.0.5:
   version "1.0.11"
-  resolved "https://registry.npm.taobao.org/pako/download/pako-1.0.11.tgz?cache=0&sync_timestamp=1580284264887&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fpako%2Fdownload%2Fpako-1.0.11.tgz#6c9599d340d54dfd3946380252a35705a6b992bf"
+  resolved "https://registry.npm.taobao.org/pako/download/pako-1.0.11.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fpako%2Fdownload%2Fpako-1.0.11.tgz#6c9599d340d54dfd3946380252a35705a6b992bf"
   integrity sha1-bJWZ00DVTf05RjgCUqNXBaa5kr8=
 
-parse-asn1@^5.0.0:
+parse-asn1@^5.0.0, parse-asn1@^5.1.5:
   version "5.1.5"
   resolved "https://registry.npm.taobao.org/parse-asn1/download/parse-asn1-5.1.5.tgz#003271343da58dc94cace494faef3d2147ecea0e"
   integrity sha1-ADJxND2ljclMrOSU+u89IUfs6g4=
@@ -428,9 +485,9 @@ path-browserify@0.0.1:
   integrity sha1-5sTd1+06onxoogzE5Q4aTug7vEo=
 
 pbkdf2@^3.0.3:
-  version "3.0.17"
-  resolved "https://registry.npm.taobao.org/pbkdf2/download/pbkdf2-3.0.17.tgz#976c206530617b14ebb32114239f7b09336e93a6"
-  integrity sha1-l2wgZTBhexTrsyEUI597CTNuk6Y=
+  version "3.1.1"
+  resolved "https://registry.npm.taobao.org/pbkdf2/download/pbkdf2-3.1.1.tgz#cb8724b0fada984596856d1a6ebafd3584654b94"
+  integrity sha1-y4cksPramEWWhW0abrr9NYRlS5Q=
   dependencies:
     create-hash "^1.1.2"
     create-hmac "^1.1.4"
@@ -470,6 +527,11 @@ punycode@^1.2.4:
   resolved "https://registry.npm.taobao.org/punycode/download/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
   integrity sha1-wNWmOycYgArY4esPpSachN1BhF4=
 
+punycode@^2.1.0, punycode@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.npm.taobao.org/punycode/download/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
+  integrity sha1-tYsBCsQMIsVldhbI0sLALHv0eew=
+
 querystring-es3@^0.2.0:
   version "0.2.1"
   resolved "https://registry.npm.taobao.org/querystring-es3/download/querystring-es3-0.2.1.tgz#9ec61f79049875707d69414596fd907a4d711e73"
@@ -508,6 +570,15 @@ readable-stream@^2.0.2, readable-stream@^2.3.3, readable-stream@^2.3.6:
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
+readable-stream@^3.6.0:
+  version "3.6.0"
+  resolved "https://registry.npm.taobao.org/readable-stream/download/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
+  integrity sha1-M3u9o63AcGvT4CRCaihtS0sskZg=
+  dependencies:
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
+
 readline-sync@^1.4.7:
   version "1.4.10"
   resolved "https://registry.npm.taobao.org/readline-sync/download/readline-sync-1.4.10.tgz#41df7fbb4b6312d673011594145705bf56d8873b"
@@ -521,16 +592,30 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^3.0.0"
     inherits "^2.0.1"
 
-safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.2.0:
-  version "5.2.0"
-  resolved "https://registry.npm.taobao.org/safe-buffer/download/safe-buffer-5.2.0.tgz#b74daec49b1148f88c64b68d49b1e815c1f2f519"
-  integrity sha1-t02uxJsRSPiMZLaNSbHoFcHy9Rk=
+safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@^5.2.0, safe-buffer@~5.2.0:
+  version "5.2.1"
+  resolved "https://registry.npm.taobao.org/safe-buffer/download/safe-buffer-5.2.1.tgz?cache=0&sync_timestamp=1589129611964&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fsafe-buffer%2Fdownload%2Fsafe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+  integrity sha1-Hq+fqb2x/dTsdfWPnNtOa3gn7sY=
 
 safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
-  resolved "https://registry.npm.taobao.org/safe-buffer/download/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
+  resolved "https://registry.npm.taobao.org/safe-buffer/download/safe-buffer-5.1.2.tgz?cache=0&sync_timestamp=1589129611964&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fsafe-buffer%2Fdownload%2Fsafe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
   integrity sha1-mR7GnSluAxN0fVm9/St0XDX4go0=
 
+"safer-buffer@>= 2.1.2 < 3":
+  version "2.1.2"
+  resolved "https://registry.npm.taobao.org/safer-buffer/download/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
+  integrity sha1-RPoWGwGHuVSd2Eu5GAL5vYOFzWo=
+
+schema-utils@^2.6.6:
+  version "2.7.0"
+  resolved "https://registry.npm.taobao.org/schema-utils/download/schema-utils-2.7.0.tgz#17151f76d8eae67fbbf77960c33c676ad9f4efc7"
+  integrity sha1-FxUfdtjq5n+793lgwzxnatn078c=
+  dependencies:
+    "@types/json-schema" "^7.0.4"
+    ajv "^6.12.2"
+    ajv-keywords "^3.4.1"
+
 setimmediate@^1.0.4:
   version "1.0.5"
   resolved "https://registry.npm.taobao.org/setimmediate/download/setimmediate-1.0.5.tgz#290cbb232e306942d7d7ea9b83732ab7856f8285"
@@ -549,10 +634,10 @@ shadow-cljs-jar@1.3.2:
   resolved "https://registry.npm.taobao.org/shadow-cljs-jar/download/shadow-cljs-jar-1.3.2.tgz#97273afe1747b6a2311917c1c88d9e243c81957b"
   integrity sha1-lyc6/hdHtqIxGRfByI2eJDyBlXs=
 
-shadow-cljs@^2.8.94:
-  version "2.8.94"
-  resolved "https://registry.npm.taobao.org/shadow-cljs/download/shadow-cljs-2.8.94.tgz#62896a2478439d7c46cb4912e7c14c26e027d22b"
-  integrity sha1-YolqJHhDnXxGy0kS58FMJuAn0is=
+shadow-cljs@^2.10.19:
+  version "2.10.19"
+  resolved "https://registry.npm.taobao.org/shadow-cljs/download/shadow-cljs-2.10.19.tgz#907bbad10bb3af38f6a728452e3cd9c34f1166d1"
+  integrity sha1-kHu60Quzrzj2pyhFLjzZw08RZtE=
   dependencies:
     node-libs-browser "^2.0.0"
     readline-sync "^1.4.7"
@@ -561,17 +646,20 @@ shadow-cljs@^2.8.94:
     which "^1.3.1"
     ws "^3.0.0"
 
-source-map-loader@^0.2.4:
-  version "0.2.4"
-  resolved "https://registry.npm.taobao.org/source-map-loader/download/source-map-loader-0.2.4.tgz#c18b0dc6e23bf66f6792437557c569a11e072271"
-  integrity sha1-wYsNxuI79m9nkkN1V8VpoR4HInE=
+source-map-loader@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.npm.taobao.org/source-map-loader/download/source-map-loader-1.0.1.tgz#703df5345b0816734f0336c1ccee8af66e082061"
+  integrity sha1-cD31NFsIFnNPAzbBzO6K9m4IIGE=
   dependencies:
-    async "^2.5.0"
-    loader-utils "^1.1.0"
+    data-urls "^2.0.0"
+    iconv-lite "^0.5.1"
+    loader-utils "^2.0.0"
+    schema-utils "^2.6.6"
+    source-map "^0.6.0"
 
 source-map-support@^0.4.15:
   version "0.4.18"
-  resolved "https://registry.npm.taobao.org/source-map-support/download/source-map-support-0.4.18.tgz?cache=0&sync_timestamp=1572390065703&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fsource-map-support%2Fdownload%2Fsource-map-support-0.4.18.tgz#0286a6de8be42641338594e97ccea75f0a2c585f"
+  resolved "https://registry.npm.taobao.org/source-map-support/download/source-map-support-0.4.18.tgz#0286a6de8be42641338594e97ccea75f0a2c585f"
   integrity sha1-Aoam3ovkJkEzhZTpfM6nXwosWF8=
   dependencies:
     source-map "^0.5.6"
@@ -581,6 +669,11 @@ source-map@^0.5.6:
   resolved "https://registry.npm.taobao.org/source-map/download/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
   integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
 
+source-map@^0.6.0:
+  version "0.6.1"
+  resolved "https://registry.npm.taobao.org/source-map/download/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+  integrity sha1-dHIq8y6WFOnCh6jQu95IteLxomM=
+
 stream-browserify@^2.0.1:
   version "2.0.2"
   resolved "https://registry.npm.taobao.org/stream-browserify/download/stream-browserify-2.0.2.tgz#87521d38a44aa7ee91ce1cd2a47df0cb49dd660b"
@@ -591,7 +684,7 @@ stream-browserify@^2.0.1:
 
 stream-http@^2.7.2:
   version "2.8.3"
-  resolved "https://registry.npm.taobao.org/stream-http/download/stream-http-2.8.3.tgz#b2d242469288a5a27ec4fe8933acf623de6514fc"
+  resolved "https://registry.npm.taobao.org/stream-http/download/stream-http-2.8.3.tgz?cache=0&sync_timestamp=1588701397289&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fstream-http%2Fdownload%2Fstream-http-2.8.3.tgz#b2d242469288a5a27ec4fe8933acf623de6514fc"
   integrity sha1-stJCRpKIpaJ+xP6JM6z2I95lFPw=
   dependencies:
     builtin-status-codes "^3.0.0"
@@ -600,7 +693,7 @@ stream-http@^2.7.2:
     to-arraybuffer "^1.0.0"
     xtend "^4.0.0"
 
-string_decoder@^1.0.0:
+string_decoder@^1.0.0, string_decoder@^1.1.1:
   version "1.3.0"
   resolved "https://registry.npm.taobao.org/string_decoder/download/string_decoder-1.3.0.tgz#42f114594a46cf1a8e30b0a84f56c78c3edac21e"
   integrity sha1-QvEUWUpGzxqOMLCoT1bHjD7awh4=
@@ -626,6 +719,13 @@ to-arraybuffer@^1.0.0:
   resolved "https://registry.npm.taobao.org/to-arraybuffer/download/to-arraybuffer-1.0.1.tgz#7d229b1fcc637e466ca081180836a7aabff83f43"
   integrity sha1-fSKbH8xjfkZsoIEYCDanqr/4P0M=
 
+tr46@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.npm.taobao.org/tr46/download/tr46-2.0.2.tgz?cache=0&sync_timestamp=1582173621185&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ftr46%2Fdownload%2Ftr46-2.0.2.tgz#03273586def1595ae08fedb38d7733cee91d2479"
+  integrity sha1-Ayc1ht7xWVrgj+2zjXczzukdJHk=
+  dependencies:
+    punycode "^2.1.1"
+
 tty-browserify@0.0.0:
   version "0.0.0"
   resolved "https://registry.npm.taobao.org/tty-browserify/download/tty-browserify-0.0.0.tgz#a157ba402da24e9bf957f9aa69d524eed42901a6"
@@ -636,6 +736,13 @@ ultron@~1.1.0:
   resolved "https://registry.npm.taobao.org/ultron/download/ultron-1.1.1.tgz#9fe1536a10a664a65266a1e3ccf85fd36302bc9c"
   integrity sha1-n+FTahCmZKZSZqHjzPhf02MCvJw=
 
+uri-js@^4.2.2:
+  version "4.2.2"
+  resolved "https://registry.npm.taobao.org/uri-js/download/uri-js-4.2.2.tgz#94c540e1ff772956e2299507c010aea6c8838eb0"
+  integrity sha1-lMVA4f93KVbiKZUHwBCupsiDjrA=
+  dependencies:
+    punycode "^2.1.0"
+
 url@^0.11.0:
   version "0.11.0"
   resolved "https://registry.npm.taobao.org/url/download/url-0.11.0.tgz#3838e97cfc60521eb73c525a8e55bfdd9e2e28f1"
@@ -644,33 +751,52 @@ url@^0.11.0:
     punycode "1.3.2"
     querystring "0.2.0"
 
-util-deprecate@~1.0.1:
+util-deprecate@^1.0.1, util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.npm.taobao.org/util-deprecate/download/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
 
 util@0.10.3:
   version "0.10.3"
-  resolved "https://registry.npm.taobao.org/util/download/util-0.10.3.tgz#7afb1afe50805246489e3db7fe0ed379336ac0f9"
+  resolved "https://registry.npm.taobao.org/util/download/util-0.10.3.tgz?cache=0&sync_timestamp=1588238397004&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Futil%2Fdownload%2Futil-0.10.3.tgz#7afb1afe50805246489e3db7fe0ed379336ac0f9"
   integrity sha1-evsa/lCAUkZInj23/g7TeTNqwPk=
   dependencies:
     inherits "2.0.1"
 
 util@^0.11.0:
   version "0.11.1"
-  resolved "https://registry.npm.taobao.org/util/download/util-0.11.1.tgz#3236733720ec64bb27f6e26f421aaa2e1b588d61"
+  resolved "https://registry.npm.taobao.org/util/download/util-0.11.1.tgz?cache=0&sync_timestamp=1588238397004&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Futil%2Fdownload%2Futil-0.11.1.tgz#3236733720ec64bb27f6e26f421aaa2e1b588d61"
   integrity sha1-MjZzNyDsZLsn9uJvQhqqLhtYjWE=
   dependencies:
     inherits "2.0.3"
 
 vm-browserify@^1.0.1:
   version "1.1.2"
-  resolved "https://registry.npm.taobao.org/vm-browserify/download/vm-browserify-1.1.2.tgz?cache=0&sync_timestamp=1572870772154&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fvm-browserify%2Fdownload%2Fvm-browserify-1.1.2.tgz#78641c488b8e6ca91a75f511e7a3b32a86e5dda0"
+  resolved "https://registry.npm.taobao.org/vm-browserify/download/vm-browserify-1.1.2.tgz#78641c488b8e6ca91a75f511e7a3b32a86e5dda0"
   integrity sha1-eGQcSIuObKkadfUR56OzKobl3aA=
 
+webidl-conversions@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.npm.taobao.org/webidl-conversions/download/webidl-conversions-5.0.0.tgz#ae59c8a00b121543a2acc65c0434f57b0fc11aff"
+  integrity sha1-rlnIoAsSFUOirMZcBDT1ew/BGv8=
+
+whatwg-mimetype@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.npm.taobao.org/whatwg-mimetype/download/whatwg-mimetype-2.3.0.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fwhatwg-mimetype%2Fdownload%2Fwhatwg-mimetype-2.3.0.tgz#3d4b1e0312d2079879f826aff18dbeeca5960fbf"
+  integrity sha1-PUseAxLSB5h5+Cav8Y2+7KWWD78=
+
+whatwg-url@^8.0.0:
+  version "8.1.0"
+  resolved "https://registry.npm.taobao.org/whatwg-url/download/whatwg-url-8.1.0.tgz#c628acdcf45b82274ce7281ee31dd3c839791771"
+  integrity sha1-xiis3PRbgidM5yge4x3TyDl5F3E=
+  dependencies:
+    lodash.sortby "^4.7.0"
+    tr46 "^2.0.2"
+    webidl-conversions "^5.0.0"
+
 which@^1.3.1:
   version "1.3.1"
-  resolved "https://registry.npm.taobao.org/which/download/which-1.3.1.tgz?cache=0&sync_timestamp=1574116262707&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fwhich%2Fdownload%2Fwhich-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
+  resolved "https://registry.npm.taobao.org/which/download/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
   integrity sha1-pFBD1U9YBTFtqNYvn1CRjT2nCwo=
   dependencies:
     isexe "^2.0.0"
@@ -684,10 +810,10 @@ ws@^3.0.0:
     safe-buffer "~5.1.0"
     ultron "~1.1.0"
 
-ws@^7.2.3:
-  version "7.2.3"
-  resolved "https://registry.npm.taobao.org/ws/download/ws-7.2.3.tgz#a5411e1fb04d5ed0efee76d26d5c46d830c39b46"
-  integrity sha1-pUEeH7BNXtDv7nbSbVxG2DDDm0Y=
+ws@^7.3.1:
+  version "7.3.1"
+  resolved "https://registry.npm.taobao.org/ws/download/ws-7.3.1.tgz#d0547bf67f7ce4f12a72dfe31262c68d7dc551c8"
+  integrity sha1-0FR79n985PEqct/jEmLGjX3FUcg=
 
 xtend@^4.0.0:
   version "4.0.2"