Function classof

lib/web/polyfill.js:94–98

(it)

  return toString.call(it).slice(8, -1);
}
function classof(it){
  var O, T;
  return it == undefined ? it === undefined ? 'Undefined' : 'Null'
    : typeof (T = (O = Object(it))[SYMBOL_TAG]) == 'string' ? T : cof(O);
}

// Function
var call  = FunctionProto.call