Support for OCaml trunk

[hhugo]

• Move constructor Bigarray.Float16 last in the type Bigarray.kind ocaml/ocaml#12357
• trunk-support does't build with ocaml-trunk ocaml-ppx/ppxlib#449 trunk-support supports trunk ocaml-ppx/ppxlib#451
• Add I/O primitives for Bigarrays ocaml/ocaml#12365
• Get rid of the LongString module ocaml/ocaml#12360
• Refactor Dynlink startup to avoid parsing bytecode sections twice ocaml/ocaml#12599
• https://github.com/ocsigen/js_of_ocaml/tree/fix-for-12500
• normalize \r*\n newlines to \n during lexing ocaml/ocaml#12514 (maybe cleanup possible on windows)
• Store both ends of the stack chain in continuations ocaml/ocaml#12735
• Move compressed marshaling away from the stdlib and into the compilers (trunk version) ocaml/ocaml#12758
• Refactoring and extending the Digest module with better hash functions ocaml/ocaml#12307
• Simplify dynamic bytecode loading by having the runtime append RETURN 1 ocaml/ocaml#12430
• runtime/array.c: rename make-array functions ocaml/ocaml#13003

[kit-ty-kate]

Is this the PR for OCaml 5.2 or for current trunk?

[hhugo]

This is for current trunk. Master is compatible with 5.2. I was planning a new release but I need to fix some regression first (unrelated to 5.2)

[kit-ty-kate]

Ah, sorry some tests were failing locally on master and i didn't see that there was a release actively being worked on. Sorry for the noise.

[hhugo]

Note that there are many tests that only pass with a specific version of OCaml (mostly expect tests)