"This must be a valid PostScript name."

[annevk]

This seems like a conformance requirements for people creating fonts? I'm not sure how this requirement helps implementers. What should they do if it's not a valid PostScript name, for instance?

[inexorabletash]

An implementation shouldn't return items with non-valid PostScript names. So if there were a malformed file, it should not be presented to the web site / returned via the enumeration, since this would be unexpected.

This is the one place where I felt sanitizing/filtering the data should be explicit, given that PostScript names are likely to be used as unique IDs in many cases, so saying something about those IDs seemed important.

[annevk]

But where is that required? Or if that is somehow required due to how fonts are defined this can be an assert, right?

[inexorabletash]

An assert is a good suggestion - I'll change it. thx!