> Sure, any subs will do - they don't have to be constants:

you mean any sub with empty prototype which is the way how constants are implemented in constant

see https://perldoc.perl.org/perlsub#Constant-Functions °

and the OP's code still compiles even if your return values are not constant.

°) NB:

sub FLAG_MASK ()    { FLAG_FOO | FLAG_BAR }

sub FOO_SET () { 1 if FLAG_MASK & FLAG_FOO }
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