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I just did a code review that took an hour and a half. Most of that time was spent on phrasing comments to be inoffensive from multiple angles. The second biggest chunk of time was, of course, proving that A.I. false positives were indeed false.
Almost every time there is a variable in front end code, the A.I. says that it must be properly validated. The start of every single function in the stack must be validating all the variables again, if it is to be believed.