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I want lazy redun task result expressions to support Python item access through expr key and slicing…

I want lazy redun task result expressions to support Python item access through expr key and slicing…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Indexing should work for sequence positions and mapping keys: if a task returns "a", "b", "c" , using its result…

The task

Indexing should work for sequence positions and mapping keys: if a task returns `["a", "b", "c"]`, using its result as `items()[1]` in a downstream task should evaluate to `"b"`; if a task returns `{ "value": 3 }`, using `outputs()["value"]` in a downstream task should evaluate to `3`. Slices should expand into a…

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