Additional traits for reference iterators #12
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Most importantly, Clone. See bodil/im-rs#134.
Piggy-backing Debug when at it, because, why not.
Not implementing Copy even where it would be possible, as that could
turn into footgun (iterators "forking").
Not implementing Clone on consuming iterators, as that also clones the
elements and that's probably not intended.
Note: I'm submitting it now, but it depends on bodil/bitmaps#4 (currently pulls a git based dependency, which needs to be removed before merging).