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> I wonder why the first read from an empty file returns nil rather
> than an empty string.
> E.g. fp:read(10) --> nil
> 
> If the zero-sized file exists then it can be interpreted as a file
> containing an empty string (IMHO).

Yes, that is a valid interpretation. With that interpretation, all
reads after the last character would return an empty string, as there
are infinite empty strings between the last character and the end of
file.

-- Roberto