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* Luiz Henrique de Figueiredo:

>> 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.

Doesn't this result in rather unclear error message?