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Allows the user to specify a list of excluded OS's for a given release. Which is particularly useful for avoiding errors when repos don't support a specific OS.
Not sure what you'll think of this one, feel free to reject it if you don't like the changes, or would prefer this to be done a different way.
I also changed common error types to be evaluated by an actual Error interfaces rather than their message strings to make the pattern a bit more extensible and so that people didn't have to guess where error strings were being evaluated.