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> I just realized that the manual doesn't say much about the return
> value of file:close for handles created by regular
> [...]
> IMHO the manual should mention at least briefly what those methods
> return in general. What do you think?

The manual says this:

  Unless otherwise stated, all I/O functions return nil on failure (plus
  an error message as a second result and a system-dependent error code
  as a third result) and some value different from nil on success.


What else could it say?

-- Roberto