> If you don't know what endianness is

It is not feasible for someone to write endian portable code in a language like Zig without understanding what endianness is imo. Regardless of how they change @bitCast there will be other cases that break this like doing @ptrCast + @memcpy.

Also this breaks currently written code that is endian portable and uses @byteSwap like it is done in most other programming languages that do these things.