Make Declaration.__add__ try harder to produce consistent resolution orders #238
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By moving things from the RHS to the front of the list if they already extend something from the LHS.
Fixes #193
The changes in the documentation are a good example of the kind of weird things that used to happen but which should now make more sense. Previously, you could get
IRoot2
ahead ofIDerived2
, which is inconsistent.I'm not 100% positive this covers all possible cases (deeply nested hierarchies, branching at weird places) but it does fix the easy/common ones that I've seen in the real world. It can be improved as needed given further examples.