Re: Userdata and GC activity

[Luiz Henrique de Figueiredo <lhf@...>]

> When a statement is closed (either on the C or Lua side), the pointer
> in its userdata object is nulled.  All Lua wrappers check that it is
> not null and error out.

I usually remove the metatable from userdata objects that have been closed
explicitly instead of storing NULL and checking.