How to build ocaml-base-compiler.5.3.0 for msvc?

[Alizter]

I've been trying to install OCaml 5.3 for msvc but it keeps detecting it as mingw and conflicting:

I'm doing:

opam switch create foo --packages ocaml-base-compiler.5.3.0,system-msvc

Is there an issue with the package layout or am I doing something wrong?

Creating a switch with ocaml-variants.5.2.0,system-msvc works completely fine on the other hand.