• Add U+231C-231Fi and U+2A7D-2A7E to the math font.
• Add script math alphabet based on that of XITS Math font.
• Add monospaced math alphabet based on that of cmtt10 font with modified METAFONT parameters to better fit with Libertinus glyphs.
• Improve math top accent positions.
• Fix spacing of math italic i and j.
• Increase the gap between \sum and its limits.
• Improved math braces and brackets based on STIX Two Math font.
• Disable optical variants of math alphanumerics that were based on the text sup/superscript glyphs as they don’t look good besides being incomplete and inconsistent.
• Remove duplicate glyphs that caused broken GPOS generation.
• Drop optical bounds (‘opbd’, ‘rtbd’ and ‘lfbd’) features as they were incomplete and virtually unsupported.
• Fix text mark placement below O and o.
• Fix oldstyle numbers feature in Libertinus Serif Semibold that had wrong glyph mapping for 6, 7, 8 and 9.
• Use swash Q when followed by v.
• Various consistency fixes to font names and vertical metrics.
• Fix placement of the half ring in U+1E9A.
• Fix several Libertinus Serif Bold italic alternate glyphs that were not bold.
• Fix Libertinus Serif Italic U+2098-2099 (subscript m and n) that looked like superscript circled + and -.