[googlefonts/STAT/axisregistry] fails for any value other than Default

[mitradranirban]

Observed behaviour
My font's STAT table has 2 instances in Slant Axis -20 = Oblique and 0 = Default

Fontspector googlefonts/STAT/axisregistry reports

FAIL
On the font variation axis 'slnt', the name 'Oblique' is not among the expected ones (Default) according to the Google Fonts Axis Registry.

Expected behaviour
as per data in https://github.com/googlefonts/axisregistry/blob/main/Lib/axisregistry/data/slant.textproto

tag: "slnt"
display_name: "Slant"
min_value: -90
max_value: 90
default_value: 0
precision: 0
fallback {
name: "Default"
value: 0
}
fallback_only: false
illustration_url: "slant.svg"
description:
"Adjust the style from upright to slanted. Negative values produce"
" right-leaning forms, also known to typographers as an 'oblique' style."
" Positive values produce left-leaning forms, also called a 'backslanted'"
" or 'reverse oblique' style."

So Value 0 should be "Default", any value < 0 should be "Oblique", and any value > 0 sould be "Reverse Oblique"

[simoncozens]

This is correct for the behavior of the slnt axis as used by Google Fonts; see https://googlefonts.github.io/gf-guide/variable.html#ital--slnt

In general your STAT table is right; the googlefonts profile is not a general purpose font profile but embeds expectations about the GF platform which has particular requirements for slanted VFs.