Great idea, could you add some tests for this similar to those for any of and all of?
(e.g. in test_all_of_ref_schema.rb and test_any_of_ref_schema.rb)

Also, this change seems to cause a test failure related to oneOf

Looking at the test, i'm not sure why it was working before.
insert_defaults will insert foo => "view" into data, so data now matches both variants of oneOf, which should fail.

But still, there's seems to be an error in my patch, because even {foo => view} doesn't seem to validate
I'll try to fix this and write tests

Oh, okay, i finally get, how test works. "default" inserts value only for one oneOf case, which will fail with strict, and the first one will pass.
I forgot to handle exceptions, that's why it was failing. Now it works.
I'll write tests for oneOf tomorrow

Okay, i've added tests for sub-errors

Seems fine to me 👍

Ok, I'm happy with this 👍

Merging