I don't think your idea is evil in anyway. I like Perl because it is flexible and it lets you do what you want and assumes you know what you are doing.
I can see where doing the type of checking you are talking about could limit your debugging time. That time savings would be increased as the number of developers having to interact with new code increases. Not knowing the coding environment it is difficult for anyone say if all the checks are really needed in the long run. It might be nice to be able to put the checks into their own method or function that could be overridden via configration variables, that is bypass the tests entirely under certain conditions.
Another module that you might want to check out is Params::Validate
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