YAML 1.2 leaves data types ambiguous, merely making the "Norway problem" optional and at the mercy of the application rather than, in the words of https://yaml.org/type/ (which has not been marked as deprecated), "strongly recommended".
Those schemas aren't part of the core schema, and you may interpret them if you are aiming for full 1.1 compatibility. If you're aiming for 1.1 compatibility, then you accept the Norway problem.
