bugfix: compare Bits and sizeof(Arithmetic) * 8

[awfeequdng]

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compare Bits and sizeof(Arithmetic)：because Bits is bit count, but sizeof(Arithmetic) is byte count, so compare Bits and sizeof(Arithmetic) like this:
Bits < sizeof(Arithmetic) * 8
or Bits > sizeof(Arithmetic) * 8
or Bits == sizeof(Arithmetic) * 8

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