approved by someone

Fork that fixes the issue.

clearly the best solution

At least I learnt that you can hide imports, thanks.

For Haskell solution you can either probably
import Prelude hiding (minimum, maximum)
after the module line or just remove the
(minimum, maximum)
from the module line.

Haskell Stderr in running of tests gives a warning. Probably a change in the compiler or something.

that's actually not the issue. The real problem is that there aren't any sample tests. (this comes from the default example)

Haskell sample tests try to import Example module when the code has Banjo. Resulting in

ExampleSpec.hs:6:8:
    Could not find module `Example'
    Use -v to see a list of the files searched for.

You can just change import Example to import Banjo in tests as a workaround, but not everybody might realize this.