Le 26/05/2012 13:53, Tom Van Cutsem a écrit :
Hi,
If __proto__ is getting standardized, I propose we adapt proxies to be
able to trap getPrototypeOf.
Why?
- with __proto__, stable prototypes are no longer an invariant. It's
awkward to make proxies go out of their way to maintain it still.
This is very true.
- it's much more consistent with all the other Object.* methods:
Object.keys(proxy) => calls keys trap
Object.getPrototypeOf(proxy) => calls getPrototypeOf trap
- it makes membranes much simpler, because they can now do:
getPrototypeOf: function(target) {
return wrap(Object.getPrototypeOf(target));
}
This saves the extra object allocation to create a dummy target with a
wrapped prototype.
To be consistent with the other traps, if we buy into a getPrototypeOf
trap, we should add a getPrototypeOf method in the "reflect" module as
well (basically an alias for Object.getPrototypeOf).
Your thoughts?
I agree a lot with your rationale. I have no comment on the "how", but
what you said makes sense.
Additionally, I'd like to add that if __proto__ gets in the spec, it
should be clearly stated that proxy.__proto__ calls the get and set
traps and does not get/set the prototype of the proxy without being trapped.
David
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