audiofile -- endian issues

On a big-endian machine would I still need to swap endian when saving to
a .wav file.  I'm fairly sure that for the .wav format it is always assumed that the PCM is little
endian.  The lib won't accept anything but little endian for afInitByteOrder().  
And it doesn't seem to be doing any byte swapping on it's own
when writing a .wav on a big endian machine.

Is this the case for all the formats?