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This is a vastly improved version of #1. I learned a lot about rust since the first try, and this one here is much more elegant and much more flexible. Plus it will help a lot for coming changes. It uses some neat tricks from rusts awesome type system. Including genericness over owned and shared data, associated types and higher kinded trait bounds. Once rust-lang/rfcs#2071 and rust-lang/rfcs#1598 are implemented the code can be cleaned up a little further.