Bump to v4.0.0.

internal/Hash.js

@@ -0,0 +1,18 @@
+define(['./nativeCreate'], function(nativeCreate) {
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /**
+   * Creates an hash object.
+   *
+   * @private
+   * @returns {Object} Returns the new hash object.
+   */
+  function Hash() {}
+
+  // Avoid inheriting from `Object.prototype` when possible.
+  Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+
+  return Hash;
+});