It is a good point. All caps subs are reserved, so it's better to use "constants" with at least a non-cap (underscore etc...). 

use constant MY_PACKAGE => 'blah blah';
use constant APPROX_PI     => 3.1415926;
use constant _PI_          => 3;          # ugly?

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cheers --stephan

In reply to Re: Constant names come into conflict with Perl style? by sgt
in thread Constant names come into conflict with Perl style? by dmitri

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