This codec automatically fills missing json attributes as long as they are Seq, Option or Map.

This emulates to some extent gRPC / proto behaviour, where all fields are optional.

We should use:

• deriveRelaxedCodec:
  • for gRPC scalaPb generated case classes
• deriveConfiguredCodec:
  • for JS mirrors of gRPC classes
  • for proto base lib classes (not generated), (they have default value)
  • for gRPC scalaPb generated roots of ADT

For scalar types that should have default values, you can use the extension deriveRelaxedCodedWithDefaults which takes a map of default values.

DO NOT USE deriveRelaxedCodec FOR Protobuf ENUM.

You will likely get: 'JSON decoding to CNil should never happen'. In this case, create separate Encoder / Decoder using stringDecoderForEnum / stringEncoderForEnum.

Do not forget to also create a Schema for the openapi.yml encoding. Otherwise, your enum will be translated into objects and you will likely end up with inconsistencies between Tapir and the openapi.yml.