The open-endedness of this led me to write a bit, then read a few things, then produce unnecessarily long responses, and so on, so I deleted everything to spare people. I'll go with saying thanks for the input.
But here's an interesting related link: http://blog.codinghorror.com/gold-plating/ Related because more general than double checking is any sort of code changes that have (should have) no effect (refactoring). My OCD nature is the cause of this thread. Are there acceptable shortcuts anywhere? According to Neil's second paragraph, yes.
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