Function getType

static/vuejs/vue.esm.js:1420–1423

* Use function string name to check built-in types, * because a simple equality check will fail when running * across different vms / iframes.

(fn)

 * across different vms / iframes.
 */
function getType (fn) {
  var match = fn && fn.toString().match(/^\s*function (\w+)/);
  return match && match[1]
}

function isType (type, fn) {
  if (!Array.isArray(fn)) {