Function cof

lib/web/polyfill.js:91–93

(it)

  if(it && !has(it = stat ? it : it[PROTOTYPE], SYMBOL_TAG))hidden(it, SYMBOL_TAG, tag);
}
function cof(it){
  return toString.call(it).slice(8, -1);
}
function classof(it){
  var O, T;
  return it == undefined ? it === undefined ? 'Undefined' : 'Null'