'use strict';

var uniq  = require('../array/#/uniq')
  , value = require('./valid-value')

  , push = Array.prototype.push
  , getOwnPropertyNames = Object.getOwnPropertyNames
  , getPrototypeOf = Object.getPrototypeOf;

module.exports = function (obj) {
	var keys;
	obj = Object(value(obj));
	keys = getOwnPropertyNames(obj);
	while ((obj = getPrototypeOf(obj))) {
		push.apply(keys, getOwnPropertyNames(obj));
	}
	return uniq.call(keys);
};