I prototype a lot of my C microcontroller code in Perl, and for that purpose so I, and others might benefit, I wrote Bit::Manip. That contains code that has to be compiled, so for a Pure Perl version, there's Bit::Manip::PP.
It does all the things that we who have to do bitwise operations from time-to-time but not as a profession (or often enough to remember how) we need to do.
Here's an example of turning 'off' a bit:
use Bit::Manip qw(:all);
my $num = 0b11100111; # or literal 231
my $bit_position = 6;
my $flipped = bit_off($num, $bit_position);
printf("orig: %b\n", $num);
printf("flipped: %b\n", $flipped);
steve@maezi ~/scratch >perl bit.pl
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