I'm wondering:

What are the cases where Perl decides to use UV for a variable, i.e. negatives are ruled out?

or is this only for internal use, like array indices?

Update

To answer my own question, bitwise operations won't like a sign. (Doh!)

FWIW: perlnumber only mentions this indirectly, for the exception made with use integer

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re^2: Largest integer in 64-bit perl by LanX
in thread Largest integer in 64-bit perl by harangzsolt33

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