I have some concerns about the game of whack-a-mole here, we clearly do not do this validation on most of the set_* methods.

But, adding to all would be a much larger task, and has performance considerations as well. And this one has proven to be problematic, in at least one instance, so not too upset at adding it here.

If it weren't for Artist.set() and **kwargs on __init__ expanding to set_* methods, I'd argue that this job is actually pretty well handled by type checking... But those are two pretty massive holes (as well as, of course, type checking being optional).