Improve support for covariant returns (where generic types are involved) #643
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Fixes #632.
It turns out that we only added support for non-generic covariant return types in #619; however there are two additional cases that we need to support, too:
(I'm counting those as two distinct cases due to the code structure found inside
MethodSignatureComparer.EqualSignatureTypes
, which is the method that needs to be augmented.)