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by notaplumber 2213 days ago
This is simply not true. For a lot software you will get 1.3 automatically, for example mutt and irssi pick it up just fine. The existing APIs will work and LibreSSL will prefer TLS 1.3 over 1.2 if clients/servers support it.

OpenSSL offers some additional APIs for certain TLS 1.3 features, but are hardly mandatory.