This release contains support for Protocol Buffers packed fields, as well as several bugfixes. It uses Kotlin 1.6.21 by default.

Protobuf packed fields

It is now possible to encode and decode Kotlin classes to/from Protobuf messages with packed repeated fields. To mark the field as packed, use @ProtoPacked annotation on it. Note it affects only List and primitive collection such as IntArray types. With this feature, it is now possible to decode Proto3 messages, where all repeated fields are packed by default. Protobuf schema generator also supports new @ProtoPacked annotation.

Many thanks to Paul de Vrieze for his valuable contribution!

Other improvements & small features

• Incorporate JsonPath into exception messages (#1841)
• Mark block in corresponding encodeStructure/decodeStructure extensions as crossinline to reduce amount of bytecode (#1917)
• Support serialization of compile-time Collection<E> properties that are not lists at the runtime (#1821)
• Best-effort kotlin reflect avoidance in serializer(Type) (#1819)

Bugfixes

• Iterate over element indices in ObjectSerializer in order to let the format skip unknown keys (#1916)
• Correctly support registering both default polymorphic serializer & deserializer (#1849)
• Make error message for captured generic type parameters much more straightforward (#1863)