Bump to v4.12.0.

_listCacheGet.js

@@ -0,0 +1,23 @@
+define(['./_assocIndexOf'], function(assocIndexOf) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Gets the list cache value for `key`.
+   *
+   * @private
+   * @name get
+   * @memberOf ListCache
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  function listCacheGet(key) {
+    var data = this.__data__,
+        index = assocIndexOf(data, key);
+
+    return index < 0 ? undefined : data[index][1];
+  }
+
+  return listCacheGet;
+});