This release changes very little in the core fonts.
However, the Rec Mono code-specific fonts have been updated to make their code ligatures work properly in more monospace-only environments, and have gotten a few stylistic sets pre-applied for clear, unambiguous code: a simplified L, Z, l, & f and a more-open 6 and 9.
Note: if you prefer to code without ligatures and/or to have more control over OpenType features, the normal Recursive Mono fonts still have extensive OpenType options as detailed in the main project readme.