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BUG: DataFrame.astype(dict) can cause column metadata to be lost

BUG: DataFrame.astype(dict) can cause column metadata to be lost: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Code Sample, a copy-pastable example if possible Setup: Using .astype(dict) loses column metadata: Problem description Column metadata is lost: the name has been…

The task

Code Sample, a copy-pastable example if possible Setup: Using .astype(dict) loses column metadata: Problem description Column metadata is lost: the name has been removed and it has been cast from UInt64Index to Int64Index. Expected Output I'd expect the columns post-astype to…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.