Comment by anamax

> Since bits aren't addressable, they don't really have an order in memory.

Bits aren't addressable in the dominant ISAs today, but they were addressable by popular ISAs in the past, such as the PDP-10 family.

The PDP-10 is one of the big reasons why network byte order is big-endian.

That said, I forget whether the PDP-10 was big-endian or little-endian wrt bits.