Perhaps Proxy.isProxy was used merely as an example, but wasn't the consensus that Proxy.isProxy is not needed? Dave pointed out that it breaks transparent virtualization. Also, there is Object.isExtensible which always returns |true| for (trapping) proxies. That means we already have "half" of Proxy.isProxy without exposing proxies: if !Object.isExtensible(obj), obj is guaranteed not to be a proxy.
Cheers, Tom 2011/7/9 Brendan Eich <bren...@mozilla.com> > Also the Proxy.isTrapping, which in recent threads has been proposed to be > renamed to Proxy.isProxy or Object.isProxy. >
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