Bump to v4.11.2.

_toKey.js

@@ -1,5 +1,8 @@
 define(['./isSymbol'], function(isSymbol) {
 
+  /** Used as references for various `Number` constants. */
+  var INFINITY = 1 / 0;
+
   /**
    * Converts `value` to a string key if it's not a string or symbol.
    *
@@ -7,8 +10,12 @@ define(['./isSymbol'], function(isSymbol) {
    * @param {*} value The value to inspect.
    * @returns {string|symbol} Returns the key.
    */
-  function toKey(key) {
-    return (typeof key == 'string' || isSymbol(key)) ? key : (key + '');
+  function toKey(value) {
+    if (typeof value == 'string' || isSymbol(value)) {
+      return value;
+    }
+    var result = (value + '');
+    return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
   }
 
   return toKey;