Very nice.

BTW in contrast to the normal unpack templates, which are (as any experienced perler knows) documented under pack, this feature is documented only under unpack:

In addition to fields allowed in pack(), you may prefix a field with a %<number> to indicate that you want a <number>-bit checksum of the items instead of the items themselves.

In reply to Re^2: Bitwise operators on binary objects by bart
in thread Bitwise operators on binary objects by albert

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