Move away from rlang?

[Bisaloo]

Currently, we use some functions from rlang that are marked as internal but still exported (message_cnd(), error_cnd()). It is not entirely clear to me what this means. Here is what https://r-pkgs.org/ says about it:

Generally, keywords are not that useful except for @Keywords internal. Using the internal keyword removes the function from the package index and disables some of its automated tests. It’s common to use @Keywords internal for functions that are of interest to other developers extending your package, but not most users.

Does this mean their use is discouraged in our case?

At the moment, we don't rely use the fact that objects of class fhub_validations are a list of conditions. We could easily design it as a list of other S3 objects.

The only other rlang function we use is format_error_bullets() and it could be replace by the equivalent cli::cli_bullets().