Observe callback being triggered for the changes made before Object.observe

[miyconst]

Code snippet to test:

var obj = {};
var callback1 = function () {
};
var callback2 = function () {
    throw "this callback should not be called as it was attached after the changes were made";
};

obj.value1 = "value 1";
Object.observe(obj, callback1);

obj.value2 = "value 2";
Object.observe(obj, callback2);

Note: the code works correct under npm, but fails in IE and Firefox.

[MaxArt2501]

Nice catch, I'll look into it later.