Since we don't support the ital axis, in fact, and require separate roman and italic files at the moment (due to concerns eg in https://arrowtype.github.io/vf-slnt-test), then we should reflect that actual implementation in the axis definition.
Since we have zero families with an ital axis, this should be a no-op when pushed; but this is a very peculiar move, and may have unexpected consequences when pushed.
min_value: 0
max_value: 1
default_value: 0
-precision: -1
+precision: 0
fallback {
name: "Roman"
value: 0