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>While fiddling with the commandline tool last night trying out various
>io operations, I noticed that if one prints out the value of a result of
>, you get told it's a 'file' object.
>I was wondering how this is done, since currently all my userdata
>objects come out as 'userdata' which is a bit irritating.

Using a __tostring metamethod: tostring looks into metatables of userdata
and use the field __tostring if present.