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Empty hashes ( array<K, V ) are not serialized correctly

Empty hashes ( array<K, V ) are not serialized correctly: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). When $metadata actually has entries, everything works fine across all three formats — JSON gives me an object, XML wraps the entries in the property element…

The task

When `$metadata` actually has entries, everything works fine across all three formats — JSON gives me an object, XML wraps the entries in the property element, YAML emits a proper mapping.

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