ExactSizeIterator and FusedIterator for IntoIter #6
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I needed the ExactSizeIterator trait for RBMap for a test.
Since the three IntoIter structs are quite similar I could implement it for all of them.
Sadly my test didn't work out the way I needed it to, so there is no rush with this PR.
If you do decide to merge this I would suggest that you take a look at the clippy issues before publishing.