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[BUG] [OCaml] Generation of `unknown_base_type:UNKNOWN_BASE_TYPE` isn't valid

See original GitHub issue

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What’s the actual output vs expected output?
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Description

The issue happens when I tried with stripe and github apis, which It could happen to any spec as well.

openapi-generator version

v5.0.0

OpenAPI declaration file content or url

https://github.com/stripe/openapi/blob/master/openapi/spec3.yaml

Generation Details

openapi-generator-cli generate -i stripe.yaml -g ocaml -o stripe --enable-post-process-file

Steps to reproduce

Run dune build inside the root project

Suggest a fix

The main issue happens to use a capital letter for a record type since OCaml reserves capital letters for variants. If it’s as easy as renaming it, I would suggest using lower-case for the unknown-types.