On __proto__ as a magical data property
brendan at mozilla.org
Wed Jul 18 13:31:35 PDT 2012
Brendan Eich wrote:
> Your suggestion of the setter checking that the receiving object
> inherit the built-in __proto__ before actually doing the "set" is
> interesting, but it seems to me that it means every set does a
> proxy-observable "has" operation. That's not something we do today --
> maybe it's ok to add it -- but it is also overhead and opportunity for
> mischief. Or did you have a thought on how to silently probe for the
> property descriptor?
In particular, we don't want a proto-chain walk from [[CanPut]] and a
second walk from the "has" under the __proto__ setter for
obj.__proto__ = safe; // not in SES code
just because we might need the "has" for
evil = Object.getOwnPropertyDescriptor(Object.prototype,
// later ...
How would you spec this?
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