more work

node_modules/lodash/object/keys.js

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+var isLength = require('../internal/isLength'),
+    isNative = require('../lang/isNative'),
+    isObject = require('../lang/isObject'),
+    shimKeys = require('../internal/shimKeys');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys;
+
+/**
+ * Creates an array of the own enumerable property names of `object`.
+ *
+ * **Note:** Non-object values are coerced to objects. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.keys)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ * @example
+ *
+ * function Foo() {
+ *   this.a = 1;
+ *   this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.keys(new Foo);
+ * // => ['a', 'b'] (iteration order is not guaranteed)
+ *
+ * _.keys('hi');
+ * // => ['0', '1']
+ */
+var keys = !nativeKeys ? shimKeys : function(object) {
+  if (object) {
+    var Ctor = object.constructor,
+        length = object.length;
+  }
+  if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
+      (typeof object != 'function' && isLength(length))) {
+    return shimKeys(object);
+  }
+  return isObject(object) ? nativeKeys(object) : [];
+};
+
+module.exports = keys;