You can't. Perl scalars can be used both as numbers
and strings. Perl converts between the two internally
and seamlessly.
Actually, that's not completely true. You might be
able to do some deep XS magic to find out whether the
string slot or the number slot in the SV has been used,
but I'm guessing that you don't really want to go
there :)
--
< http://www.dave.org.uk>
Perl Training in the UK <http://www.iterative-software.com>
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