Endianness doesn't matter though, for the reasons Rob Pike explained. For example, the bits inside each byte have an endianness probably inside the CPU but they

Endianness doesn't matter though, for the reasons Rob Pike explained. For example, the bits inside each byte have an endianness probably inside the CPU but they're not addressable so no one thinks about that. The brilliance of Rob Pike's recommendation is that it allows our code to be byte order agnostic for the same reasons our code is already bit order agnostic. I agree about bsf/bsr/popcnt. I wish ASCII had more punctuation marks because those operations are as fundamental as xor/and/or/shl/shr/sar.