Enriched Descriptors, maybe ES7 ?

[Brendan Eich]

Tom has experimented, IIRC. I don't know which implementations preserve 
extended property descriptor properties.

/be

Allen Wirfs-Brock wrote:
> Note that ES6 proxies as specified permits 
> Object.defineProperty/getOwnPropertyDescriptor to pass custom 
> attributes in property descriptors and even passes them along (not 
> sure if anybody has actually implemented this yet) wherever there is a 
> internal get descriptor/set descriptor sequence.  Proxies that support 
> custom attributes might be an interest way toi experiment with some of 
> these ideas.