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20:35:05
stassats
(logand #xFF (ash (the fixnum i) (the fixnum c))) can now use modular arithmetic
20:35:44
stassats
could be extended to any integers, as long as the shift amount and the mask make it use the bits from the first word
20:36:09
stassats
but the modarith machinery doesn't pass the width of the actual mask, always just uses the full word