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Add `#[must_use]` to Array::map The output of Array::map is intended to be an array of the same size, and does not modify the original in place nor is it intended for side-effects. Thus, under normal circumstances it should be consumed. See [discussion](https://internals.rust-lang.org/t/array-map-annotate-with-must-use/22813/26). Attaching to tracking issue #75243