diff --git a/lodash.js b/lodash.js
index d2af99a4a..149234fe0 100644
--- a/lodash.js
+++ b/lodash.js
@@ -616,7 +616,11 @@
     /** Used to restore the original `_` reference in `noConflict` */
     var oldDash = context._;
 
-    /** Used as the maximum value returned by `toLength` */
+    /**
+     * Used as the maximum length an array-like object.
+     * See the [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength)
+     * for more details.
+     */
     var maxSafeInteger = Math.pow(2, 53) - 1;
 
     /** Used to resolve the internal [[Class]] of values */
@@ -1343,8 +1347,7 @@
           iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
-        length = toLength(length);
+      if (typeof length == 'number' && length > -1 && length <= maxSafeInteger) {
         if (support.unindexedChars && isString(iterable)) {
           iterable = iterable.split('');
         }
@@ -1372,8 +1375,7 @@
       var iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
-        length = toLength(length);
+      if (typeof length == 'number' && length > -1 && length <= maxSafeInteger) {
         if (support.unindexedChars && isString(iterable)) {
           iterable = iterable.split('');
         }
@@ -2205,20 +2207,6 @@
       return result;
     }
 
-    /**
-     * Converts `value` to an integer suitable for use as the length of an array-like
-     * object. See the [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength)
-     * for more details.
-     *
-     * @private
-     * @param {*} value The value to convert.
-     * @returns {number} Returns the converted integer.
-     */
-    function toLength(value) {
-      var result = +value || 0;
-      return result < 0 ? 0 : (result < maxSafeInteger ? result : maxSafeInteger);
-    }
-
     /*--------------------------------------------------------------------------*/
 
     /**
@@ -3573,10 +3561,10 @@
      * // => true
      */
     function contains(collection, target, fromIndex) {
-      var length = toLength(collection && collection.length);
+      var length = collection ? collection.length : 0;
       fromIndex = (typeof fromIndex == 'number' && +fromIndex) || 0;
 
-      if (length) {
+      if (typeof length == 'number' && length > -1 && length <= maxSafeInteger) {
         if (typeof collection == 'string' || !isArray(collection) && isString(collection)) {
           if (fromIndex >= length) {
             return false;
@@ -4470,7 +4458,7 @@
         collection = collection.split('');
       }
       if (n == null || guard) {
-        var length = toLength(collection && collection.length);
+        var length = collection ? collection.length : 0;
         return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
       }
       var result = shuffle(collection);
@@ -4529,7 +4517,9 @@
      */
     function size(collection) {
       var length = collection ? collection.length : 0;
-      return typeof length == 'number' && length > -1 ? length : keys(collection).length;
+      return (typeof length == 'number' && length > -1 && length <= maxSafeInteger)
+        ? length
+        : keys(collection).length;
     }
 
     /**
@@ -4690,7 +4680,7 @@
      */
     function toArray(collection) {
       var length = collection && collection.length;
-      if (typeof length == 'number' && length > -1) {
+      if (typeof length == 'number' && length > -1 && length <= maxSafeInteger) {
         return (support.unindexedChars && isString(collection))
           ? collection.split('')
           : slice(collection);