diff --git a/wasm/grains/coverage/clover.xml b/wasm/grains/coverage/clover.xml
index 25236086..f08d13fa 100644
--- a/wasm/grains/coverage/clover.xml
+++ b/wasm/grains/coverage/clover.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<coverage generated="1699635296047" clover="3.2.0">
-  <project timestamp="1699635296047" name="All files">
+<coverage generated="1699667927006" clover="3.2.0">
+  <project timestamp="1699667927006" name="All files">
     <metrics statements="0" coveredstatements="0" conditionals="0" coveredconditionals="0" methods="0" coveredmethods="0" elements="0" coveredelements="0" complexity="0" loc="0" ncloc="0" packages="0" files="0" classes="0"/>
   </project>
 </coverage>
diff --git a/wasm/grains/coverage/lcov-report/index.html b/wasm/grains/coverage/lcov-report/index.html
index e6ce2fae..9b8e2375 100644
--- a/wasm/grains/coverage/lcov-report/index.html
+++ b/wasm/grains/coverage/lcov-report/index.html
@@ -86,7 +86,7 @@ <h1>All files</h1>
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2023-11-10T16:54:56.045Z
+                at 2023-11-11T01:58:47.004Z
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/wasm/grains/grains.wat b/wasm/grains/grains.wat
index 508a3573..c6586d3e 100644
--- a/wasm/grains/grains.wat
+++ b/wasm/grains/grains.wat
@@ -33,7 +33,22 @@
 
   ;; Result is unsigned i64
   (func (export "total") (result i64)
-    ;; let it wrap to get the highest value
-    (i64.const -1)
+    ;; let it wrap to get the highest value (u64::MAX)
+    ;; (i64.const -1)
+
+    ;; ((((1_u64) << 63) - 1) << 1) + 1
+    (i64.add
+      (i64.shl
+        (i64.sub
+          (i64.shl
+            (i64.const 1)
+            (i64.const 63)
+            ) ;; shl
+          (i64.const 1)
+          ) ;; sub
+          (i64.const 1)
+        ) ;; shl
+        (i64.const 1)
+      ) ;; add
   )
 )
diff --git a/wasm/grains/run-tests-wasm.txt b/wasm/grains/run-tests-wasm.txt
index b985236e..8cbc8c95 100644
--- a/wasm/grains/run-tests-wasm.txt
+++ b/wasm/grains/run-tests-wasm.txt
@@ -18,38 +18,38 @@ Node versions:
 
 Running: js-beautify ./babel.config.js ./grains.spec.js
 
-beautified babel.config.js
-beautified grains.spec.js
+beautified babel.config.js - unchanged
+beautified grains.spec.js - unchanged
 
 real	0m0.086s
-user	0m0.090s
-sys	0m0.011s
+user	0m0.084s
+sys	0m0.015s
 
 
  ==============================================================================
 
 Exit code: 0
 
-real	0m0.398s
-user	0m0.396s
-sys	0m0.065s
+real	0m0.390s
+user	0m0.373s
+sys	0m0.079s
 
-real	0m0.402s
-user	0m0.397s
-sys	0m0.067s
+real	0m0.393s
+user	0m0.376s
+sys	0m0.079s
 
 ===============================================================================
 
 Running: npm install
 
-up to date in 489ms
+up to date in 533ms
 
 107 packages are looking for funding
   run `npm fund` for details
 
-real	0m0.650s
-user	0m0.868s
-sys	0m0.083s
+real	0m0.698s
+user	0m0.947s
+sys	0m0.077s
 
 ===============================================================================
 
@@ -70,8 +70,8 @@ Running: rm -rf ./coverage
 
 
 real	0m0.001s
-user	0m0.000s
-sys	0m0.001s
+user	0m0.001s
+sys	0m0.000s
 
 
  ==============================================================================
@@ -82,22 +82,22 @@ Running: npm run test -- --coverage
 > test
 > node --experimental-vm-modules node_modules/jest/bin/jest.js ./* --coverage
 
-(node:21762) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
+(node:28458) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
 (Use `node --trace-warnings ...` to show where the warning was created)
 PASS ./grains.spec.js
   Grains
-    ✓ returns the total number of grains on the board (1 ms)
+    ✓ returns the total number of grains on the board
     returns the number of grains on the square
-      ✓ grains on square 1 (1 ms)
+      ✓ grains on square 1 (2 ms)
       ✓ grains on square 2
-      ✓ grains on square 3
-      ✓ grains on square 4 (1 ms)
-      ✓ grains on square 16
-      ✓ grains on square 32 (1 ms)
+      ✓ grains on square 3 (1 ms)
+      ✓ grains on square 4
+      ✓ grains on square 16 (1 ms)
+      ✓ grains on square 32
       ✓ grains on square 64
       ✓ square 0 has no value
       ✓ negative square has no value
-      ✓ square greater than 64 has no value
+      ✓ square greater than 64 has no value (1 ms)
 
 ----------|---------|----------|---------|---------|-------------------
 File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
@@ -107,33 +107,33 @@ All files |       0 |        0 |       0 |       0 |
 Test Suites: 1 passed, 1 total
 Tests:       11 passed, 11 total
 Snapshots:   0 total
-Time:        0.545 s, estimated 1 s
+Time:        0.314 s, estimated 1 s
 Ran all test suites matching /.\/HELP.md|.\/LICENSE|.\/README.md|.\/babel.config.js|.\/grains.spec.js|.\/grains.wat|.\/node_modules|.\/package-lock.json|.\/package.json|.\/run-tests-wasm.txt/i.
 
-real	0m1.141s
-user	0m1.144s
-sys	0m0.150s
+real	0m0.925s
+user	0m0.908s
+sys	0m0.111s
 
 
  ==============================================================================
 
 Exit code: 0
 
-real	0m1.441s
-user	0m1.436s
-sys	0m0.205s
+real	0m1.245s
+user	0m1.248s
+sys	0m0.179s
 
-real	0m1.443s
-user	0m1.437s
-sys	0m0.205s
+real	0m1.248s
+user	0m1.250s
+sys	0m0.180s
 
 ===============================================================================
 
 Running: misspell ./grains.wat
 
-real	0m0.034s
-user	0m0.037s
-sys	0m0.015s
+real	0m0.037s
+user	0m0.047s
+sys	0m0.011s
 
 ===============================================================================