font.info.unitsPerEm seems to be required

[typemytype]

https://github.com/googlei18n/cu2qu/blob/master/Lib/cu2qu/ufo.py#L224

would be nice to have some fallback value when the value is not set

[anthrotype]

What should the default unitsPerEm value be?
I guess 1000.
Maybe the UFO spec should say what the fallback value is when the value is not set.

[typemytype]

The default 'DEFAULT_MAX_ERR' makes it confusing...

It should not be calculated from UPM if it is not set

On Wednesday, 21 September 2016, Cosimo Lupo notifications@github.com
wrote:

What should the default unitsPerEm value be?
I guess 1000.
Maybe the UFO spec should say what the fallback value is when the value is
not set.

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gr Frederik
www.typemytype.com

[anthrotype]

Yeah, that's a bit confusing.

Also, I think we should disallow using a relative approximation error to convert compatibly fonts having different UPEMs, since OpenType Variations must have the same UPEM (if I am not mistaken).