Get the bits only?

use constant CAN_PACK_QUADS => !! eval { my $f = pack 'q'; 1 };
sub Int64  { unpack( ( CAN_PACK_QUADS  ? 'q<' : 'a8' ), $_[-1] ) }
sub UInt64 { unpack( ( CAN_PACK_QUADS  ? 'Q<' : 'a8' ), $_[-1] ) }

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In reply to Re: Equivalent of unpack 'q' with 32-bit Perl (a8) by Anonymous Monk
in thread Equivalent of unpack 'q' with 32-bit Perl by Limbic~Region

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