Unique keys should be required otherwise should give failure.

[jonathan-s]

Right now the following yaml

a:
  - b
  - c

a:
  q: a
  q: b

Would get something akin to {'a': {'q': 'b'}}

PyYaml has similar behaviour as seen here > yaml/pyyaml#165 according to spec keys should be unique. This issue probably needs to be resolved upstream, but worth keeping this as a reminder.

[jonathan-s]

It looks like this was resolved here > dtolnay/serde-yaml#301, so in version 0.9.4