Check had some nice ideas but lacks development, actively hinders usage of new
features added to the testing package (sub-tests, fuzzing) and with the advent
of Go 1.18 type parameters, is heavily biased towards reflection and interface{},
aka "any", which can mask bugs that would have been reported at compile time
with a less dynamic approach.

Some tests were changed more dramatically than others.

Signed-off-by: Zygmunt Krynicki <me@zygoon.pl>