5.2.0~alpha1: Format.pp_set_geometry cannot be set to Int.max_int anymore

[kit-ty-kate]

#12477 added a check for each geometry when using Format.pp_set_geometry so that the margin wouldn't go above pp_infinity. This has the intended consequence of making such code fail at runtime:

# Format.pp_set_geometry Format.std_formatter ~max_indent:2 ~margin:Int.max_int;;
Exception: Invalid_argument "Format.pp_set_geometry: margin >= pp_infinity".

I've noticed this code used in the wild in at least https://github.com/RedPRL/asai (other users may not have surfaced yet due to the runtime nature of the failure) and I'm wondering what would be the best course of action for users that have this sort of code.
Replace Int.max_int by 1_000_000_000 and add a TODO comment asking to replace it in the future by Format.pp_infinity when the project requires at least OCaml 5.2 ?

[favonia]

This turns out to be more annoying than expected. One has to write ~margin:(Format.pp_infinity-1) because the margin cannot be equal to pp_infinity either.

[Octachron]

Using 1_000_000_000 might be a good enough option.

I was wondering if the set_geometry function should clip the value during the a transition period, but the specification of the function is that it never tries to second guess the user (contrarily to the safe function).