Bump to v4.1.0.

_MapCache.js

@@ -0,0 +1,28 @@
+define(['./_mapClear', './_mapDelete', './_mapGet', './_mapHas', './_mapSet'], function(mapClear, mapDelete, mapGet, mapHas, mapSet) {
+
+  /**
+   * Creates a map cache object to store key-value pairs.
+   *
+   * @private
+   * @param {Array} [values] The values to cache.
+   */
+  function MapCache(values) {
+    var index = -1,
+        length = values ? values.length : 0;
+
+    this.clear();
+    while (++index < length) {
+      var entry = values[index];
+      this.set(entry[0], entry[1]);
+    }
+  }
+
+  // Add functions to the `MapCache`.
+  MapCache.prototype.clear = mapClear;
+  MapCache.prototype['delete'] = mapDelete;
+  MapCache.prototype.get = mapGet;
+  MapCache.prototype.has = mapHas;
+  MapCache.prototype.set = mapSet;
+
+  return MapCache;
+});