Bump to v3.0.0.

internal/shimKeys.js

@@ -0,0 +1,42 @@
+import isArguments from '../lang/isArguments';
+import isArray from '../lang/isArray';
+import isIndex from './isIndex';
+import isLength from './isLength';
+import keysIn from '../object/keysIn';
+import support from '../support';
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * A fallback implementation of `Object.keys` which creates an array of the
+ * own enumerable property names of `object`.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns the array of property names.
+ */
+function shimKeys(object) {
+  var props = keysIn(object),
+      propsLength = props.length,
+      length = propsLength && object.length;
+
+  var allowIndexes = length && isLength(length) &&
+    (isArray(object) || (support.nonEnumArgs && isArguments(object)));
+
+  var index = -1,
+      result = [];
+
+  while (++index < propsLength) {
+    var key = props[index];
+    if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) {
+      result.push(key);
+    }
+  }
+  return result;
+}
+
+export default shimKeys;