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This makes using constants easier, as you don't have to remember what
sigil do constants use.

=head1 NOTES

As the Perl compiler needs to know about which barewords are keywords,
constants have to defined in C<BEGIN> section. Usually, this is not a
problem, as C<use> statement is automatically put in implicit C<BEGIN>
section, but that also means you cannot dynamically create constants.
For example, in the example below, the C<DEBUG> constant is always
created, with value 1, as C<use> is processed when Perl parser sees
it.

    if ($ENV{DEBUG}) {
        use Acme::constant DEBUG => 1; # WRONG!
    }

It's possible to dynamically use this module using L<if> module,
however, this is likely to cause problems when trying to use constant
that doesn't exist.