I would rephrase into this: if you need a getOwnPropertyNames trap, you might need for consistency a getOwnPropertySymbols independently from getOwnPropertyDescriptors since these methods are already available.
I also would like to add a couple of links to support the fact getOwnPropertyDescriptors is needed, and has been asked for, since quite a while: this was 11th of November 2011 ... I didn't know it, and now that I do I wonder why this has been post-poned for so long and never discussed again. https://mail.mozilla.org/pipermail/es-discuss/2011-November/018275.html Best Regards On Thu, Mar 6, 2014 at 11:24 AM, C. Scott Ananian <ecmascr...@cscott.net>wrote: > If you use a getOwnPropertyNames trap, then you also need a > getOwnPropertySymbols trap to implement getOwnPropertyDescriptors. > --scott > > On Thu, Mar 6, 2014 at 2:16 AM, Tom Van Cutsem <tomvc...@gmail.com> wrote: > > 2014-03-05 20:11 GMT+01:00 C. Scott Ananian <ecmascr...@cscott.net>: > >> > >> On Wed, Mar 5, 2014 at 1:39 PM, Tom Van Cutsem <tomvc...@gmail.com> > wrote: > >> > Object.getOwnPropertyDescriptors(proxy) would trigger the > >> > getOwnPropertyNames trap, followed by calls to the > >> > getOwnPropertyDescriptor > >> > trap for each individual property. > >> > >> [[OwnPropertyKeys]], `ownKeys` trap. > > > > > > Yes, according to the current draft spec. I have a pending discussion > with > > Allen that we actually need to reintroduce a [[GetOwnPropertyNames]] > > internal method / getOwnPropertyNames trap, as the `ownKeys` trap > doesn't do > > any invariant checking, which is needed for a reliable Object.isFrozen > test. > > > > Regards, > > Tom >
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