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…