Internet Explorer 8 compatibility? about seamless-immutable

[rtfeldman]

The development build definitely cannot work in IE8 because IE8 does not support Object.freeze. I can't think of any reason why the production build would not work, however.

I don't personally have the bandwidth to test this, but if someone else can verify this, I can update the README to note that the production build works in IE8.

[lewisje]

The worse problem with IE8 is that Object.defineProperty only works on DOM nodes, and even a polyfill won't give IE8 the ability to make ordinary object members non-writable and non-deletable; to be more specific, you can make a sham version of Object.defineProperty that goes through the motions, so that you can load seamless-immutable without having it throw errors, but the objects it returns won't actually be immutable because there is no support in the engine for that.

es5-sham does exactly this, by the way, and something similar with Object.freeze and Object.isSealed and the like; it does have an admirable version of Object.isExtensible that tries its hardest to extend an object, just to see whether it can be done.

[rtfeldman]

Thanks @lewisje - sounds like the resolution here is that it can't work.