Fair enough. I considered a bug to be any behavior the engineers didn't plan in the code. They have their own specification, in their heads, that is more techni

Fair enough. I considered a bug to be any behavior the engineers didn't plan in the code. They have their own specification, in their heads, that is more technical/exact than the business specification. Your definition is also reasonable but it's not what people mean when they say "there's no such thing as bug-free code", because bugs of my definition are almost unavoidable.