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Known Issues
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mli only modules
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These are supported, however using them might cause make it impossible for
non-jbuilder users to use your library. We tried to use them for some internal
module generated by Jbuilder and it broke the build of projects not using
Jbuilder:

https://github.com/ocaml/dune/issues/567

So, while they are supported, you should be careful where you use them. Using a
`.ml` only module is still preferable.