On 09/11/2013 03:38 PM, Jason Orendorff wrote:
On Wed, Sep 11, 2013 at 9:08 AM, Tom Van Cutsem <[email protected]> wrote:
Currently the pattern for this is [[Get]]+[[Call]]. We cannot refactor to
[[Has]] + [[Invoke]] in general, because [[Has]] will return true also for
non-callable values.
If we believe these are call-sites where it is worth avoiding the allocation
of a function, then having an additional internal method like [[GetMethod]]
or [[InvokeConditional]] makes sense, but I doubt it's worth the added
complexity.
But as Allen said, [[Invoke]] is not a performance hack. It's a
correctness hack.
It permits proxies to customize their behavior around `this`, and even
naive .invoke trap users would definitely want those customizations to
apply for implicit .toString() and .then().
Except that [[Invoke]] doesn't solve the correctness problem either. As we
discussed at a prior meeting, it fails in the case of passing 'this' as one of
the arguments.
Waldemar
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