It’s not a switch that can be flipped. Software written by humans will always contain errors. We’re fundamentally changing the way things operate, to help to make software more resistant to attacks. We’re two and a half years down a much longer road; it’s more of a 10-year timeline.
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Imagine that, I guess most of those bugs would probably turn out to be aesthetics and not actual vunerabilities. So, who knows, the definition of bug 10 years from now could be how easy an can be, it could be how the program looks.