Re: a new proposal for environments

["Juris Kalnins" <juris@...>]

On Mon, 01 Mar 2010 18:10:39 +0200, Nevin Flanagan <Alestane@comcast.net>  
wrote:

> While the philosophical change is consistent with the change to  
> closures, how would you distinguish between upvalues associated with the  
> userdata itself, and upvalues associated with the closure invoked to  
> access the userdata?

?
I'm sorry I don't follow your argument.
You can already do that in Lua 5.1, can't you?
In Lua 5.1 there is a way how to distinguish between environments
of closure and userdata. There is also a way how to access upvalues
of arbitrary value (see lua_getupvalue).
The patch I posted is about changing how values associated with userdata
are stored internally. Just because I wanted to test it quickly I reused
upvalue access functions.

> I'm in favor of such a change if it can make the model simpler and more  
> consistent, but right now it sounds like it creates two analogous  
> systems for little added benefit.

I'm sorry, I don't understand what is the second analogous system
you are talking about here.