Schema resolution fails when the reader schema contains a union with a record (or other complex type)

Schema resolution fails when the reader schema contains a union with a record (or other complex type): a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm trying to read an avro file with a reader schema that's slightly different from the writer schema (schema…

The task

I'm trying to read an avro file with a `reader_schema` that's slightly different from the writer schema (schema evolution). It works fine for simple cases, but as soon as the reader schema contains a **union with a complex type** (a record / array / map), reading blows up with a schema mismatch even though the two…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.