Hide Sentinel.UNSET values as None in lookup default()
Hide Sentinel.UNSET values as None in lookup default(): a task in repo2rlenv-pr-runtime (Harbor dataset). Title: Hide Sentinel.UNSET values as None in lookup default()
The task
**Title:** Hide `Sentinel.UNSET` values as `None` in `lookup_default()`
Part of FineEnvs/repo2rlenv-pr-runtime.