Use static::class in this cases, so the message is more correct.

[ndobromirov]

Once the exception is triggered, it's very confusing, as it points to some base class that has the behavior and not the actual class that does not comply to it's schema...

Maybe add more meta-data for debugging, like the validation errors for example.

shaper/src/Transformation/TransformationTransformerTrait.php

Line 21 in a9b1420

__CLASS__,

[e0ipso]

That's a good point. Would you be sending a PR for this?

[ndobromirov]

I could in the next week or so.

[e0ipso]

This was fixed.