Function isPromise

demo/js/main.js:2665–2667

(it)

// helpers
var isPromise = function(it){
  return isObject(it) && (useNative ? classof(it) == 'Promise' : RECORD in it);
};
var sameConstructor = function(a, b){
  // library wrapper special case
  if(LIBRARY && a === P && b === Wrapper)return true;