- [featureWriters] Added `quantization` option to `MarkFeatureWriter` and `KernFeatureWriter`, to round values to the nearest multiple of a given integer value, thus potentially optimizing the GPOS size (513, 516, 517).
- [MarkFeatureWriter] Ensure `mark` is always written before `mkmk` feature (506, 512).
- Bump minimum required fonttools >= 4.25.1. Fixes a bug with the `TTGlyphPen` when compiling glyphs with open contours (googlefonts/nanoemoji304).