David Bruant wrote:
Le 30/07/2013 00:12, Brendan Eich a écrit :
๏̯͡๏ Jasvir Nagra wrote:
Unless I am really misreading your examples, I do not think the new
proposal overcomes the problems of
http://wiki.ecmascript.org/doku.php?id=harmony:typeof_null. If
Function.setTypeOf dynamically affects subsequent use of typeof,
then action-at-a-distance problems will persist. If one library
adopts one convention regarding typeof null and another a different
one, then these libraries will not be useable together.
Right, so don't do that
This is asking to never use any currently existing library. Fixing
typeof null doesn't way enough and by a large factor.
s/way/do/ ?
You could be right. We know lexical composes best, so I'm reworking the
proto-strawman based on Jasvir's feedback.
There's no assumption of hostile code here, as usual you have to
trust what you include into your single-frame/window (realm) TCB, etc.
"This is a human-factors / phenomenology->likelihood problem."?
Sorry, you can't echo my words at me and win this argument. JS != SES.
We do not assume mutual suspicion among same-origin and transcluded
<script src=> scripts. Haven't for 17 years, won't start now.
Le 30/07/2013 01:04, Brendan Eich a écrit :
Allen Wirfs-Brock wrote:
I would argue that Functioun.setTypeOf(null, "null") is actually a
different kind of beast and one that you would want to be lexically
scoped. The difference is that it is changing the meaning of a
pre-existing operator applied to a pre-existing value. This
reinterpretation really does need to be scoped only to code that
wants to see that change.
Ok, good feedback between you and jasvir. This suggests using the
syntax I mooted:
typeof null = "null"; // lexically rebind typeof null
new code here
typeof null = "object"; // restore for old code after
I'm not sure I understand how it's different from Function.setTypeOf.
The idea here is lexical scope, so the special forms compile to bindings
that lexically alter typeof results, but library code scoped outside
this extent is unaffected by these special forms.
/be
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