Bump to v4.0.0.

internal/copyObject.js

@@ -0,0 +1,17 @@
+define(['./copyObjectWith'], function(copyObjectWith) {
+
+  /**
+   * Copies properties of `source` to `object`.
+   *
+   * @private
+   * @param {Object} source The object to copy properties from.
+   * @param {Array} props The property names to copy.
+   * @param {Object} [object={}] The object to copy properties to.
+   * @returns {Object} Returns `object`.
+   */
+  function copyObject(source, props, object) {
+    return copyObjectWith(source, props, object);
+  }
+
+  return copyObject;
+});