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Candidate is viable (with some score) if: - Candidate is exactly equal to a parameter type - Candidate type differs from a parameter type only in optionality - Parameter is a generic parameter type and all conformances are matched by a candidate type - Candidate tuples matches a parameter tuple on arity - Candidate is an `Array<T>` and parameter is an `Unsafe*Pointer` - Candidate is a subclass of a parameter class type - Candidate is a concrete type and parameter is its existential value (except Any)