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var isObject = require('./isObject.js');
var _setup = require('./_setup.js');
var _has = require('./_has.js');
var _collectNonEnumProps = require('./_collectNonEnumProps.js');

// Retrieve the names of an object's own properties.
// Delegates to **ECMAScript 5**'s native `Object.keys`.
function keys(obj) {
  if (!isObject(obj)) return [];
  if (_setup.nativeKeys) return _setup.nativeKeys(obj);
  var keys = [];
  for (var key in obj) if (_has(obj, key)) keys.push(key);
  // Ahem, IE < 9.
  if (_setup.hasEnumBug) _collectNonEnumProps(obj, keys);
  return keys;
}

module.exports = keys;