immutable-js
diff --git a/‎dist/immutable.es.js
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+5-5Lines changed: 5 additions & 5 deletions b/‎dist/immutable.es.js
Copy file name to clipboardExpand all lines: dist/immutable.es.js
+5-5Lines changed: 5 additions & 5 deletions
diff --git a/‎dist/immutable.js
Copy file name to clipboardExpand all lines: dist/immutable.js
+5-5Lines changed: 5 additions & 5 deletions b/‎dist/immutable.js
Copy file name to clipboardExpand all lines: dist/immutable.js
+5-5Lines changed: 5 additions & 5 deletions
diff --git a/‎dist/immutable.min.js
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+1-1Lines changed: 1 addition & 1 deletion b/‎dist/immutable.min.js
Copy file name to clipboardExpand all lines: dist/immutable.min.js
+1-1Lines changed: 1 addition & 1 deletion
@@ -1437,16 +1437,16 @@ function sliceFactory(collection, begin, end, useKeys) {
     return collection;
   }
 
-  var resolvedBegin = resolveBegin(begin, originalSize);
-  var resolvedEnd = resolveEnd(end, originalSize);
-
-  // begin or end will be NaN if they were provided as negative numbers and
+  // begin or end can not be resolved if they were provided as negative numbers and
   // this collection's size is unknown. In that case, cache first so there is
   // a known size and these do not resolve to NaN.
-  if (resolvedBegin !== resolvedBegin || resolvedEnd !== resolvedEnd) {
+  if (typeof originalSize === 'undefined' && (begin < 0 || end < 0)) {
     return sliceFactory(collection.toSeq().cacheResult(), begin, end, useKeys);
   }
 
+  var resolvedBegin = resolveBegin(begin, originalSize);
+  var resolvedEnd = resolveEnd(end, originalSize);
+
   // Note: resolvedEnd is undefined when the original sequence's length is
   // unknown and this slice did not supply an end and should contain all
   // elements after resolvedBegin.
 
@@ -1443,16 +1443,16 @@
       return collection;
     }
 
-    var resolvedBegin = resolveBegin(begin, originalSize);
-    var resolvedEnd = resolveEnd(end, originalSize);
-
-    // begin or end will be NaN if they were provided as negative numbers and
+    // begin or end can not be resolved if they were provided as negative numbers and
     // this collection's size is unknown. In that case, cache first so there is
     // a known size and these do not resolve to NaN.
-    if (resolvedBegin !== resolvedBegin || resolvedEnd !== resolvedEnd) {
+    if (typeof originalSize === 'undefined' && (begin < 0 || end < 0)) {
       return sliceFactory(collection.toSeq().cacheResult(), begin, end, useKeys);
     }
 
+    var resolvedBegin = resolveBegin(begin, originalSize);
+    var resolvedEnd = resolveEnd(end, originalSize);
+
     // Note: resolvedEnd is undefined when the original sequence's length is
     // unknown and this slice did not supply an end and should contain all
     // elements after resolvedBegin.