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   pinskia (pinskia@hachyderm.io)'s status on Tuesday, 19-Nov-2024 09:18:01 JST pinskia

   @fay59 that is why underlying types were added ...
   because this is an implementation defined behavior.

   GCC documents it here:
   https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Structures-unions-enumerations-and-bit-fields-implementation.html

   I can't find where clang documents their implementation defined behaviors. (I didn't look for MSVC documentation).