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> if we try to assign
> 
>    b[nil] = {}
>    
> then we get error 'table index is invalid',
> but if we try
> 
>     if b[nil] == nil then
>        ...
>     end
>     
> no error is raised. Is it correct behaviour?

Yes. In the past access to b[nil] raised an error too, but it seems
more useful to simply return nil.

-- Roberto