This is "nn::ssl::sf::SslVersion" or "nn::ssl::Context::SslVersion".
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This is "nn::ssl::sf::SslVersion" or "nn::ssl::Context::SslVersion". This is a bitmask which controls the min/max TLS versions to use, depending on which lowest/highest bits are set (if Auto isn't set). Auto uses min=1.0/max=1.2.