Oh, I agree we have to accept them as FITS/WCS header keywords, but we do *not* have to actually encourage their use in code.  In fact, I want to make every effort to discouraging it - this isn't fortran, so we're not limited to 72 characters any more :wink:

This reflects me general attitude that we are not aiming to reproduce WCS, but rather make a *better* and more pythonic take on WCS.