Change all instances of &Option<T> to Option<&T> #263
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`Option<&T>` carries the same expressive power, is slightly more efficient, and makes it easier to express some code with fewer clones. In general code that provides provides these parameters will need to change from `&foo` to `foo.as_ref()`, and from `&Some(foo)` to `Some(&foo)`. Rustc has a specific lint for `as_ref`.
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Description
Option<&T>carries the same expressive power, is slightly more efficient, andmakes it easier to express some code with fewer clones.
In general code that provides provides these parameters will need to change from
&footofoo.as_ref(), and from&Some(foo)toSome(&foo). Rustc has aspecific lint for
as_ref.Review Checklist