I mean: is it only the declared return/param types that were recently introduced? I have no idea how that printer works
I think something with namesspaces and change exceptions type or so. I believe the fix is rather easy but the package tries to be so compatible down to PHPUnit 5/6 that it's no fun and I'm almost tempted to just create my own version from 8 and onwards.
Feel free to come over and tells me your strong opinions if I'm supposed to do something specific :P