Two options: either warn the user, or do the reprojection. The second option is complex to implement (the best hope for this is some future version of SunPy). Also, no-one has complained about this so far.
Two options: either warn the user, or do the reprojection. The second option is complex to implement (the best hope for this is some future version of SunPy). Also, no-one has complained about this so far.