Bump to v4.1.0.

_baseForIn.js

@@ -0,0 +1,16 @@
+var baseFor = require('./_baseFor'),
+    keysIn = require('./keysIn');
+
+/**
+ * The base implementation of `_.forIn` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+function baseForIn(object, iteratee) {
+  return object == null ? object : baseFor(object, iteratee, keysIn);
+}
+
+module.exports = baseForIn;