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  • Upvoted for mentioning "getting something done." Commented Aug 15, 2018 at 18:57
  • 4
    Some people might note that this suffers most of the same issues as using NULL, namely that it just switches from needing NULL checks to needing "unknown" and "missing" checks, but keeps the run time crash for the lucky, silent data corruption for the unlucky as the only indicators that you forgot a check. Even missing NULL checks have the advantage that linters might catch them, but this loses that. It does add a distinction between "unknown" and "missing", though, so it beats NULL there... Commented Aug 16, 2018 at 1:19