Internal, pure reference CRC-32C / Castagnoli implementation.

Reflected polynomial 0x82F63B78, initial register and final XOR 0xFFFFFFFF, no extra augmentation or final reflection. This is not IEEE CRC-32 and is not an authenticity or durability guarantee.

update/2 accepts an unfinalized register. To checksum chunks, start with initial/0, update in byte order, and finalize exactly once. The caller owns the wire byte order; this module returns an unsigned 32-bit integer.