boring-expansion-spec
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[`post`] Relax
When backward-compatibility with existing implementations is not a concern, either a version 2.0 (with glyph-names) or 3.0 (without glyph-names) can be used, to encode italic-angle and underline-position/thickness.
If none of those are needed, the post table can be omitted. For example, the italic-angle can be encoded in the font's fvar table in a variable font, or the font's STAT table in a font that has one.