Erik van Blokland

Here "extrapolate" should mean "allowing the calculation of shapes outside the +/- 1.0 range", right?

Sorry to see.

* would these differences happen because a UFO is opened on a different platform? * or is there a use case (and environment) in which a user would be able...

Which many tools do this?

I gathered. Any others?

Fontlab files of your custom fonts as expensive NFTs. Can't do anything with them anymore but they're valuable for sure!

How would this handle one ufo source appearing in multiple designspace locations?

Yes, multiple locations should be able to point to the same source. For instance if you want to simulate a triangular space in 2D or pyramid like structures in 3....

Not sure what you mean. You propose to include location data for a master in the UFO file name. As a ufo can appear multiple times in a single designspace,...

What happens when OS/2.TypoAscender or OS/2.TypoDescender aren't set?