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Draft: Add ordering to hybrid paths

Santiago Ospina De Los Ríos requested to merge feature/three-way-comparison-path into master

Add an ordering to hybrid tree paths even for multiple types using the three way comparison operator from C++20.

Note that while the result is constexpr, the three way operator does not generate hybrid friendly comparison operators. I think this is more a question for dune-common: How to treat the ordering from the three way comparison operator for Dune::Hybrid algorithms?

TODO:

  • Document the new functionality (important: explain when it is guaranteed to be totally ordered wrt to other types)

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