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impl `Arc::unwrap_or_clone` The function gets the inner value, cloning only if necessary. The conversation started on [`irlo`](https://internals.rust-lang.org/t/arc-into-inner/15707). If the reviewer think the PR has potential to be merged, and does not need an RFC, then I will create the corresponding tracking issues and update the PR. ## Alternative names - `into_inner` - `make_owned` - `make_unique` - `take_*` (`take_inner`?)