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> What about my suggestion of an le fallback? (In brief: an le fallback is
> sufficient for partial ordering; [...]

Do you mean the following rule?

  a < b   <==>   a <= b and not b <= a

I really don't like the idea of calling a method twice for each

Or you are proposing to have both a 'le' and a 'lt' fallbacks (in a way
that you can have only one of them when you don't need the "partial"

-- Roberto