Thanks. I keep forgetting how broken un/pack are in this respect. Having "B6" load the high six bits (of the low byte of the integer) is just non-sensical.
So for the most sane configuration (bits split based on base-2 representation not some "ascending bit order" representation) you have to work harder:
unpack "C*", # 16 6-bit numeric values
pack "b6"x16, # string of 16 bytes, each holding a 6-bit value
map ''.reverse, # 16 6-character ascending-bit strings
unpack "a6"x16, # 16 6-character base-2 strings
unpack "B*", # 96-character base-2 string
"twelve bytes"; # 12-byte packed string
pack "B*", # 12-byte packed string
pack "a6"x16, # 96-character base-2 string
map ''.reverse, # 16 6-character base-2 strings
unpack "b6"x16, # 16 6-character ascending-bit strings
pack "C*", # string of 16 bytes, each holding a 6-bit value
@fields; # 16 6-bit numeric values
(29 7 29 37 27 7 25 37 8 6 9 57 29 6 21 51)
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