diff --git a/src/Illuminate/Support/Collection.php b/src/Illuminate/Support/Collection.php
index a6a7927..5ce9484 100644
--- a/src/Illuminate/Support/Collection.php
+++ b/src/Illuminate/Support/Collection.php
@@ -4,6 +4,7 @@
 
 use Countable;
 use ArrayAccess;
+use Traversable;
 use ArrayIterator;
 use CachingIterator;
 use JsonSerializable;
@@ -1241,6 +1242,8 @@ protected function getArrayableItems($items)
             return json_decode($items->toJson(), true);
         } elseif ($items instanceof JsonSerializable) {
             return $items->jsonSerialize();
+        } elseif ($items instanceof Traversable) {
+            return iterator_to_array($items);
         }
 
         return (array) $items;
diff --git a/tests/Support/SupportCollectionTest.php b/tests/Support/SupportCollectionTest.php
index fe7b71b..6077046 100644
--- a/tests/Support/SupportCollectionTest.php
+++ b/tests/Support/SupportCollectionTest.php
@@ -1354,6 +1354,54 @@ public function testWithMultipleModeValues()
         $collection = new Collection([1, 2, 2, 1]);
         $this->assertEquals([1, 2], $collection->mode());
     }
+
+    public function testSliceOffset()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([4, 5, 6, 7, 8], $collection->slice(3)->values()->toArray());
+    }
+
+    public function testSliceNegativeOffset()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([6, 7, 8], $collection->slice(-3)->values()->toArray());
+    }
+
+    public function testSliceOffsetAndLength()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([4, 5, 6], $collection->slice(3, 3)->values()->toArray());
+    }
+
+    public function testSliceOffsetAndNegativeLength()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([4, 5, 6, 7], $collection->slice(3, -1)->values()->toArray());
+    }
+
+    public function testSliceNegativeOffsetAndLength()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([4, 5, 6], $collection->slice(-5, 3)->values()->toArray());
+    }
+
+    public function testSliceNegativeOffsetAndNegativeLength()
+    {
+        $collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8]);
+        $this->assertEquals([3, 4, 5, 6], $collection->slice(-6, -2)->values()->toArray());
+    }
+
+    public function testCollectonFromTraversable()
+    {
+        $collection = new Collection(new \ArrayObject([1, 2, 3]));
+        $this->assertEquals([1, 2, 3], $collection->toArray());
+    }
+
+    public function testCollectonFromTraversableWithKeys()
+    {
+        $collection = new Collection(new \ArrayObject(['foo' => 1, 'bar' => 2, 'baz' => 3]));
+        $this->assertEquals(['foo' => 1, 'bar' => 2, 'baz' => 3], $collection->toArray());
+    }
 }
 
 class TestAccessorEloquentTestStub