Made it so that any version of Scala 3 always picks the latest known Scala 2.13.x standard library
Initial support for scala Maps in the ConfigurationSerialization framework
Fixed a bug that got introduced in version 0.17.13 (not released on SpigotMC) that would prevent plugins from loading because the loader wouldn't know which URL to use to download the scala standard library from Maven Central.
Known issues:
A bug in the bytecode generator for the serialization and deserialization methods that would occur if your class (de)serializes a primitive long or double. This bug is also present in previous versions, I just didn't know it yet at the time of those releases.