Bump to v4.1.0.

_mapHas.js

@@ -0,0 +1,21 @@
+define(['./_Map', './_assocHas', './_hashHas', './_isKeyable'], function(Map, assocHas, hashHas, isKeyable) {
+
+  /**
+   * Checks if a map value for `key` exists.
+   *
+   * @private
+   * @name has
+   * @memberOf MapCache
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  function mapHas(key) {
+    var data = this.__data__;
+    if (isKeyable(key)) {
+      return hashHas(typeof key == 'string' ? data.string : data.hash, key);
+    }
+    return Map ? data.map.has(key) : assocHas(data.map, key);
+  }
+
+  return mapHas;
+});