Test files include tests that disagree with spec

[pingiun]

I'm not 100% sure how the test cases are expected to work, because some input tests don't have a corresponding file in expected_kdl. I was running my parser against all the files in the input directory and found the underscore_at_start_of_hex.kdl file. According to the grammar in the spec, underscores at the start of numbers should not be allowed

[zkat]

https://github.com/kdl-org/kdl/blob/main/tests/README.md#full-document-test-cases

input files with no corresponding file inexpected_kdl are supposed to be parser errors :)

[pingiun]

Thanks, I must've missed that sentence