Re: Userdata example for 5.2.2

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

> There doesn't seem to be a "__gc" call though- would I be correct in 
> assuming that it isn't there as MT doesn't really need specific cleanup 
> during garbage collection?

Yes. Anyone using MT must provide a struct to it. lrandom uses
lua_newuserdata to allocate one; this memory is fully managed by Lua.

OTOH, lgdbm uses handles provided by gdbm and so must register a gc method
for closing the databases when the handle is collected in Lua.