Adds output of matchers to potential mismatch; Fixes #2468 - #3760

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• If possible / relevant include an example in the description, that could help all readers
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An example of what this looked like before, as described in #2468

This brings matchers more in line with the kind of output verify outputs for similar operations. It does also add what the stub is configured to return, such as stubbed with: [Returns: 40], which im less opinionated about. I could see it being useful though, and it would be more effort to remove it, so i left it until someone requests otherwise.

If im missing some part of the process or this needs further work, more than happy to hear about it.