Documenting how to view errors

[mockdeep]

Thanks for the library! I'm working on implementing a fake API in my tests, but one thing that I'm finding to be a little frustrating is figuring out the details of errors. Most of them I can get vague a sense of what is going wrong, though then I get Internal Server Error no implicit conversion of Array into String with no stack trace or logs, and I'm kind of stuck. Any recommendations on how to get better error information?