Sorry for the large aside, but anyone knows the whereabouts of the Flambda2 project? Can't find the GH repo anymore, only this fork I didn't know about: https://github.com/oxcaml/oxcaml/
That's the repo, Jane Street has rebranded their OCaml fork to OxCaml (as in oxidised, Rust-like). From the readme:
> This is also the home of the Flambda 2 optimiser
Their plan is to use OxCaml as their experimental fork and work with upstream to port features from it. Labelled tuples and immutable arrays for example landed in OCaml 5.4 but were originally from OxCaml.