RepositoryMetadata now exposes an ….isReactiveRepository() that's implemented by inspecting the backing repository interface for any reactive wrapper type appearing in method signatures. That allows us to move down the use of a ConversionService down to ReactiveRepositoryInformation.WrapperConversionMatch.
Made a couple of methods static that could be. Simplified some logic using streams. A bit better wording in assertions. Some formatting when using streams.
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