ArrayObserver does not work with Typed Arrays about observe-js

[rafaelw]

Yeah, unfortunately this isn't going to work any time soon. Out of curiosity, what are you trying to do? What's the specific use case?

[speigg]

I'm observing THREE.Matrix4.prototype.element typed arrays from the three.js library. It works fine with the ObjectObserver though, which is what I'm using instead.

[rafaelw]

It won't work with Object.observe enabled (which has is the default for Chrome Canary and will ship with M35).

[speigg]

I've been using Chrome Canary 35 to observe THREE.Matrix4.prototype.element typed arrays with ObjectObserver just fine. You mean it won't work with the ArrayObserver (or Array.observe) ?

[speigg]

Okay, so Object.observe seems to partially work with typed arrays. As long as the typed array is manipulated directly, it works fine. For example:

// arr is a TypedArray observed with ObjectObserver when Object.observe is enabled
arr[0] = 2 // this will work
arr.set( anotherArray ) // works if the argument is regular array, but not a typed array
arr[0] = 3 // this will work again

This seems like a bug in the implementation of Object.observe

[speigg]

argh, never-mind... I don't know what's going on. Sometimes it seems to work, sometimes not.