Unit letter

[ErwinDenissen]

It is good to see this upcoming support for variable fonts in the Adobe Feature File Specification.

I noticed a contradiction about required/optional unit letter. From what I understand, it is meant to be required, so I expect an error if it is missing.

Guide to variable features
Designspace locations and unit suffixes
A full designspace location is a comma-separated list of axis tag, axis value pairs separated by an equals sign (=). Each axis value must have a unit.

And then below it an example which lacks the unit:

“Single” variable values
For example (for a font with one wght axis):
(50 wght=0:47 wght=1000:54)

Feature File Specification Differences
2.e.iii. Variable location specifier
A represents a position in a font's variable design space. Variable locations are specified by a comma-separated list of axis location specifiers, at most one per axis. An axis is represented by its tag, and the position is specified by an axis value and an optional unit letter:
wght=800

[skef]

Thanks, missed these. They should both be fixed now