Bump to v3.0.0.

internal/mapGet.js

@@ -0,0 +1,20 @@
+define([], function() {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Gets the cached value for `key`.
+   *
+   * @private
+   * @name get
+   * @memberOf _.memoize.Cache
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the cached value.
+   */
+  function mapGet(key) {
+    return key == '__proto__' ? undefined : this.__data__[key];
+  }
+
+  return mapGet;
+});