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# Objective Memory usage optimisation ## Solution `HashMap` and `HashSet`'s keys are immutable. So using mutable types like `String`, `Vec<T>`, or `PathBuf` as a key is a waste of memory: they have an extra `usize` for their capacity and may have spare capacity. This PR replaces these types by their immutable equivalents `Box<str>`, `Box<[T]>`, and `Box<Path>`. For more context, I recommend watching the [Use Arc Instead of Vec](https://www.youtube.com/watch?v=A4cKi7PTJSs) video. --------- Co-authored-by: James Liu <contact@jamessliu.com> |
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