Taking a tip from Mark and pulling my own words out of the "Agreeing on
user-defined symbols" thread:
This serialize point is good, and gets to something I raised with Allen
yesterday, which he originally stated: realms should be *more* isolated.
We may want distribuited (cross-machine) realms. IE and other browsers
may already do cross-process window.open, returning a DCOM proxy or some
such. SpiderMonkey in Firefox uses membranes across all realm/global
boundaries, even same-origin.
Given this, I think instanceof (or typeof with an extension that must be
realm-specific because implemented by user-code, or else we have to
reify the "world of realms" as discussed in the other thread) breaking
cross-realm could be addressed by saying "proxy harder". IOW let's not
complicate JS with realms, worlds, truly global string to symbol
registries, etc. etc.
Let's get back to the simplicity of same-realm as the normal case, with
few-and-legacy exceptions. Can we do it?
-----
Realms are a good addition but if browsers are all using membranes
cross-realm, then this enables us to do more via proxies (wrappers) to
satisfy user-facing API and built-in operator constraints.
If I'm right that user-extensible methods and values, including typeof
customization, require either realm-sensitivity or else world-of-realms
spec and even more user-facing complexity, then we also ought to think
twice about the "isolate realms harder" option.
/be
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