Bump to v4.12.0.

_mapCacheSet.js

@@ -0,0 +1,19 @@
+define(['./_getMapData'], function(getMapData) {
+
+  /**
+   * Sets the map `key` to `value`.
+   *
+   * @private
+   * @name set
+   * @memberOf MapCache
+   * @param {string} key The key of the value to set.
+   * @param {*} value The value to set.
+   * @returns {Object} Returns the map cache instance.
+   */
+  function mapCacheSet(key, value) {
+    getMapData(this, key).set(key, value);
+    return this;
+  }
+
+  return mapCacheSet;
+});