Re: stack level parameter

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

On Wed, 20 Jan 2010 09:56:25 +0200, Mark Hamburg <mark@grubmah.com> wrote:

> Userdata environments are unaffected. The only thing they had in common  
> with function environments was the API that happened to be used to get  
> and set them. The existing C API routines could be renamed lua_getudenv  
> and lua_setudenv under this proposal.

Almost yes, but unfortunately, no. Currently lua_newuserdata does this:

u = luaS_newudata(L, size, getcurrenv(L))

which is imho unnecessary, and I do change it locally, but still:
  == every userdata by default has a reference to current environment ==
I really hope there is no existing code that relies on this.
It creates extra GC references, and may accumulate garbage.
</rant>
Other than that, having variable number of TValues associated would
be much more useful (similarly to how CClosure now has it).

> As I said, this language has different semantics from Lua with respect  
> to globals, but it's probably not as different as one might think for  
> most code.

And the patch might not be that big ... :)