Bump to v4.12.0.

_hashDelete.js

@@ -1,15 +1,15 @@
-import hashHas from './_hashHas';
-
 /**
  * Removes `key` and its value from the hash.
  *
  * @private
+ * @name delete
+ * @memberOf Hash
  * @param {Object} hash The hash to modify.
  * @param {string} key The key of the value to remove.
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
-function hashDelete(hash, key) {
-  return hashHas(hash, key) && delete hash[key];
+function hashDelete(key) {
+  return this.has(key) && delete this.__data__[key];
 }
 
 export default hashDelete;