On Mar 18, 2009, at 11:58 AM, Tobie Langel wrote:
On Mar 18, 2009, at 17:20 , Allen Wirfs-Brock wrote:
Would it be useful if there was a way to determine whether nor not
a function was "built-in"?
That would be useful outside of the security concerns expressed by
Mark. I'm thinking about performance and robustness concerns in JS
libraries, for example.
Can you give an example?
We're self-hosting native methods that are called built-in by the spec
in TraceMonkey, and I know V8 original self-hosted some Array and
String methods. With the right isolation to avoid violating the spec,
this is a good thing and it should not be prohibited.
Self-hosting built-ins also should not be the subject of second-
guessing versionitis in JS libraries. Shades of coding C idioms for
the microarchitecture of certain revisions of the x86!
/be
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