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.
While it shares the same name with Object.getOwnPropertyNames(), this getOwnPropertyNames trap is supposed to return string and symbol keyed properties, see http://esdiscuss.org/topic/ownpropertykeys .
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
Or even earlier, http://wiki.ecmascript.org/doku.php?id=strawman:extended_object_api from 2010.
Best Regards On Thu, Mar 6, 2014 at 11:24 AM, C. Scott Ananian <ecmascript at cscott.net <https://mail.mozilla.org/listinfo/es-discuss>>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.be at gmail.com <https://mail.mozilla.org/listinfo/es-discuss>> wrote: />/ > 2014-03-05 20:11 GMT+01:00 C. Scott Ananian <ecmascript at cscott.net <https://mail.mozilla.org/listinfo/es-discuss>>: />/ >> />/ >> On Wed, Mar 5, 2014 at 1:39 PM, Tom Van Cutsem <tomvc.be at gmail.com <https://mail.mozilla.org/listinfo/es-discuss>> />/ 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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