We might want to have a look at validations altogether (now or at some later point). I think #call should raise an exception if operation is not valid, but #valid? should not.
Coverage remained the same when pulling 02786401b5981d16e976dfae48824010e79b6f1c on feature/value-presence-validation into 67dc80dc899412ee05ad10399011f7f3c39a6afa on feature/new-api-proposal.
We might want to have a look at validations altogether (now or at some later point). I think
#call
should raise an exception if operation is not valid, but#valid?
should not.