• [colorLib/otData] Updated to latest draft COLR v1 spec (#2092).
• [svgLib] Fixed parsing error when arc commands' boolean flags are not separated by space or comma (#2094).
• [varLib] Interpret empty non-default glyphs as 'missing', if the default glyph is not empty (#2082).
• [feaLib.builder] Only stash lookup location for Debg if Builder.buildLookups_ has cooperated (#2065, #2067).
• [varLib] Fixed bug in VarStore optimizer (#2073, #2083).
• [varLib] Add designspace lib key for custom feavar feature tag (#2080).
• Add HashPointPen adapted from psautohint. With this pen, a hash value of a glyph can be computed, which can later be used to detect glyph changes (#2005).