[Bug]: Conflicting compatibility checks

[brandonh-msft]

What happened?

test_message_stream_invalid_params asserts that the response for a request with invalid parameters is a single Json RCP error response object (not a stream)
test_tasks_resubscribe_nonexistent asserts that it gets back a stream and that its first result is an error object

IMO (not sure about the spec) these two paths should yield the same type of response. Either a stream with a singular error object, or an error object alone.

Code of Conduct

• I agree to follow this project's Code of Conduct

[maeste]

Yup I'm working on this test class in general which is problematic, and also on related spec area which I agree is not clear. Thanks for opening the issue.