Take a look at Tom's explanation of the "shadow target" technique at https://research.google.com/pubs/pub40736.html section 4.3
On Tue, May 23, 2017 at 8:45 AM, Jason Orendorff <jason.orendo...@gmail.com> wrote: > On Tue, May 23, 2017 at 2:44 AM, Alex Vincent <ajvinc...@gmail.com> wrote: > >> Full details are at https://github.com/ajvincent/es7-membrane/issues/79 >> , which is where I'm hoping to find a solution. >> > > To fix this, you must create a third object for each dry proxy, to serve > as its [[ProxyTarget]]. There's no way around it. And you're right, it's > not easy; you have to implement all of the handler methods, because none of > the defaults do the right thing anymore. > > All the target checks in the design were intended to (a) allow proxies to > claim to have immutable parts; and yet (b) maintain the language's > invariants that immutable parts cannot change, even for proxies. > [[ProxyTarget]] looks like an ease-of-use feature, but it's not; it's > really in support of (a) and (b), and as you've found, it actually makes > some things harder. > > -j > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > -- Cheers, --MarkM
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