On Jan 15, 2009, at 10:18 PM, Mark S. Miller wrote:
Wonderful! And Brendan, you said earlier you were open to freezing strict arguments, and that the joining of arguments should be severed by freezing.
Yes. This is easy to implement with a few strict mode checks in existing arguments implementations I know of. Other implementors should give their thoughts, of course.
With these two changes, virtual-ES-strict-in-ES-strict emulations such as future Valija will be able to easily emulate strict arguments. An emulated strict arguments need only be a normal frozen non-array object inheriting from Array.prototype with appropriate length, caller, callee, and constructor properties. Otherwise, self- virtualizations would have needed to create a genuine arguments object, since the difference would have been observable. I should have mentioned this earlier as another motivation.
That's a good point. Emulating arguments with its magic data properties that a mysterious agent (as Allen put it) keeps in sync with parameters is Hard(tm).
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