Bump to v4.1.0.

_mapDelete.js

@@ -0,0 +1,23 @@
+import Map from './_Map';
+import assocDelete from './_assocDelete';
+import hashDelete from './_hashDelete';
+import isKeyable from './_isKeyable';
+
+/**
+ * Removes `key` and its value from the map.
+ *
+ * @private
+ * @name delete
+ * @memberOf MapCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+function mapDelete(key) {
+  var data = this.__data__;
+  if (isKeyable(key)) {
+    return hashDelete(typeof key == 'string' ? data.string : data.hash, key);
+  }
+  return Map ? data.map['delete'](key) : assocDelete(data.map, key);
+}
+
+export default mapDelete;