freifunk-app/node_modules/core-js/library/modules/$.own-keys.js

// all object keys, includes non-enumerable and symbols
var $        = require('./$')
  , anObject = require('./$.an-object')
  , Reflect  = require('./$.global').Reflect;
module.exports = Reflect && Reflect.ownKeys || function ownKeys(it){
  var keys       = $.getNames(anObject(it))
    , getSymbols = $.getSymbols;
  return getSymbols ? keys.concat(getSymbols(it)) : keys;
};