Bitfields are too useful of a feature not to use. The solution is simple: add a unit test to verify that setting one bitfield to all 1's will result in the over

Bitfields are too useful of a feature not to use. The solution is simple: add a unit test to verify that setting one bitfield to all 1's will result in the overall 32-bit or 64-bit word having the expected value. Add a comment explaining this too. That will catch nonportable use in the future.