K1 implementation of kotlinx.serialization used SerializationPluginMetadataExtensions
for two purposes:
- to extract the source-order of properties
- to identify which properties are actually serializable
In K2, the first point is covered by the compiler itself (as it correctly orders
properties during deserialization), and to cover the second point we
need to save in the propery information if it was mentioned in this extension
or not
KT-64312
Dmitriy Novozhilov
717d1c774b