[anyfoo]

Yeah, I get how those hints make sense, now that you (and others in the thread) have told me how things are, and I did overlook that HEAD is still an extra request, while the attributes are (effectively) for free.

I do wish that content negotiation (e.g. Accept headers) worked properly. In the end though, those hints implement a subset of content negotiation in a reasonable way, given the state of affairs.