Object properties are implemented via key-weak hash tables and those only support eq? as hash equality in a reliable way.
I actually can't determine how key-weak hash tables would deal with immediate Scheme values: will they never get released, or will they get released immediately? >From reading the documentation, I'd lean towards guessing the latter (as for immediate Scheme values, there _never_ is a remaining reference). That would likely make for some surprises to people, while the other option would be good for memory leaks. Either way, numbers seem like a bad idea for use in key-weak hash tables. -- David Kastrup
