I’m happy to share news of the Mutaml 0.3 release! 
Together with the recent 0.2 release, this brings Mutaml up to speed with recent ppxlib releases and addresses a few issues reported by brave, early users:
- Avoid mutations in attribute parameters #29
- Avoid polymorphic equality which is incompatible with Core #30
- Add support for ppxlib.0.28 and above #27
- Avoid triggering 2 mutations of a pattern incl. a
when-clause causing a redundant sub-pattern warning #22, #23
Happy testing! 