Get yourself just (brew install just / cargo [b]install just), and run it:
just
Does it run? Then yay! CI will most likely pass.
just miri
That one checks for UB, memory unsafety, etc.
Do not edit README.md files directly, edit README.md.in in the respective
folders.
Similarly, don't edit tuples_impls.rs, edit the tuples_impls.rs.j2 next to
it, and then run just codegen — the code is in facet-codegen/