Bump to v4.11.2.

_toKey.js

@@ -1,5 +1,8 @@
 import isSymbol from './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 @@ import isSymbol from './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;
 }
 
 export default toKey;