A small clue: the nastiness is in, or is related to Readonly. If you can do without the read only stuff the code works as expected. If you instead:
use strict;
use warnings;
use constant DBG_ANY => -1;
use constant DBG_INFO => 0x0004;
use constant DBG_KEYS => 0x0008;
use constant DBG_RAND => 0x0080;
my @Vals = ( DBG_ANY, 1, 2, DBG_INFO, DBG_KEYS, );
my $_debug_ops = (DBG_RAND | DBG_KEYS | DBG_INFO);
printf "debugops = 0x%04x\n",$_debug_ops;
it prints:
debugops = 0x008c
Perl is environmentally friendly - it saves trees
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