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 When you test your code after a complex refactoring and it just works first time and you're left wondering how it's going to subtly fuck you over some time in the future when you're least expecting it. 
 @30a83efa ime, it’s not uncommon for this to be followed by one or more of:
1. I ran the wrong version
2. Build didn’t copy binaries so you ran ‘before’ the refactor
2. You refactored in a way that the old path exist and failed to trigger the refactor path 
 @30a83efa because you know, deep down, that is totally not possible…