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Hide Sentinel.UNSET values for defaults processed by Context.invoke

Hide Sentinel.UNSET values for defaults processed by Context.invoke: a task in repo2rlenv-pr-runtime (Harbor dataset). Title: Hide Sentinel.UNSET values for defaults processed by Context.invoke

The task

**Title:** Hide `Sentinel.UNSET` values for defaults processed by `Context.invoke`

Part of FineEnvs/repo2rlenv-pr-runtime.