Actually I think it comes down to what is safe or not, to me what is safe is code I have read through and understand, the typo's are I think outside of what the safe issue is about. Either you have code checks and you read through and follow the flow and understand what it is doing, and have a typo somewhere that can cause unintended behavior.
Or you end up with code that you have no idea what it is doing and it is generating behavior you do not want, and may be entirely unsecure in many respects.
Don't confuse security and proper coding, which I think is what is happening here.
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