2.16 jackson-databind deserialization changes have broken support for the scala.util.Either class

[pjfanning]

see FasterXML/jackson-databind#4147

https://github.com/FasterXML/jackson-module-scala/actions/runs/6442522651/job/17493416303

The issue also now affects master branch but not the 2.15 branch.

Scala 2.13 is less affected than Scala 2.11/2.12 and Scala 3. The classes generated by Scala 2.13 compiler may not expose the wildcards. The deserialization issues affect types like Either[_, String] - in this case the user expects the result to be a Right so they don't provide an explicit type for the Left. This is a real edge case and something that I wouldn't encourage users to do. We have tests that do this but it was probably just a convenience for the person writing the tests.

[pjfanning]

jackson-databind changes that caused this were reverted