I think we can all agree that `Cow` is the most under-used part of @rustlang. Today (April 1 UTC) I am proposing a path for us to export this beautiful type in preludehttps://github.com/rust-lang/rfcs/pull/2672 …
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On that note, would it be possible for rustc to optimize the std Cow<[T]> | Cow<str> to be 3 words instead of 4? You can use capacity (0 or !0) instead of the tag to differentiate between owned and borrowed values, like the cowvec crate does.
