Implement FusedIterator and ExactSizeIterator where possible #159
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Also add `Iterator::count` impls where `Iterator::size_hint` was already implemented to return `(n, Some(n))`.
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Also add
Iterator::countimpls whereIterator::size_hintwas already implemented to return(n, Some(n)).I'd find these impls useful as I implement my own wrapper iterators around these iterators in a new crate I'm working on that implements a Ruby
Regexpwith multiple regex backends, one of which isonig.I've done similar work in
regex: rust-lang/regex#734.