On Jun 11, 2014, at 8:16 AM, Tom Van Cutsem wrote: > > 2014-06-11 16:48 GMT+02:00 Erik Arvidsson <erik.arvids...@gmail.com>: > > [*] Proxies are oddballs here. All Proxies have a [[Construct]] method so the > IsConstructor will always return true which is really not what you want. If > IsConstructor was changed to check for a .prototype instead proxies would > behave more inline with ordinary objects. > > No, only proxies whose target has a [[Construct]] method will themselves have > a [[Construct]] method. IOW, proxies should be completely transparent w.r.t. > the IsConstructor test. > See 9.5.15 ProxyCreate step 5.b. > > I believe there may be a spec bug, as step 4 should explicitly exclude > [[Construct]] and [[Call]], yet seems to include all methods defined in sec > 9.5. Allen? >
Kind of boarder line. 6.1.7.2 says that the "essential internal methods" are those listed in Table 5 (does not include [[Call]] and [[Constructor]]). Also the definitions of [[Call]] and [[Construct]] in 9.5 each include a note that says these internal methods are only provided when a corresponding internal method exists on the target. Reading the section as a while, I think it is pretty clear that that a Proxy only has a [[Construct]] internal method if its target also has one. Allen
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