Bump to v4.0.0.

cloneDeep.js

@@ -0,0 +1,23 @@
+import baseClone from './internal/baseClone';
+
+/**
+ * This method is like `_.clone` except that it recursively clones `value`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to recursively clone.
+ * @returns {*} Returns the deep cloned value.
+ * @example
+ *
+ * var objects = [{ 'a': 1 }, { 'b': 2 }];
+ *
+ * var deep = _.cloneDeep(objects);
+ * console.log(deep[0] === objects[0]);
+ * // => false
+ */
+function cloneDeep(value) {
+  return baseClone(value, true);
+}
+
+export default cloneDeep;