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slice: #[inline] a couple iterator methods. The one I care about and actually saw in the wild not getting inlined is clone(). We ended up doing a whole function call for something that just copies two pointers. I ended up marking as_slice / as_ref as well because make_slice is inline(always) itself, and is also the kind of think that can kill performance in hot loops if you expect it to get inlined. But happy to undo those.