Bump to v4.12.0.

_hashHas.js

@@ -10,12 +10,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * Checks if a hash value for `key` exists.
  *
  * @private
- * @param {Object} hash The hash to query.
+ * @name has
+ * @memberOf Hash
  * @param {string} key The key of the entry to check.
  * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function hashHas(hash, key) {
-  return nativeCreate ? hash[key] !== undefined : hasOwnProperty.call(hash, key);
+function hashHas(key) {
+  var data = this.__data__;
+  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
 }
 
 export default hashHas;