The problem is that unpack "b*" takes a string of bytes.

And so does unpack "B*", what you'd use to get the bits in the same order as sprintf "%b". 

$ perl -e'CORE::say unpack "B*", pack "L>", 3'
00000000000000000000000000000011

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Tip: you should use | rather than + to set a bit (in case it's already set). 

$b |= 1 << 2;

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In reply to Re: bit array comparison by ikegami
in thread bit array comparison by Amendil

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