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SSLPreferred is equivalent to PostgreSQL's sslmode=prefer: it attempts SSL negotiation and falls back to plaintext if the server refuses. TLS handshake failure (server accepts but handshake fails) is a hard failure, matching PostgreSQL's sslmode=prefer behavior. Implementation adds a _fallback_on_refusal flag to _SessionSSLNegotiating and extracts _start_ssl_negotiation / _proceed_to_connected helpers to share SSL setup code between SSLRequired and SSLPreferred. _CancelSender is updated to fall back to plaintext cancel when using SSLPreferred. Closes #81
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SSLPreferred, equivalent to PostgreSQL'ssslmode=prefer. Attempts SSL negotiation and falls back to plaintext if the server refuses ('N'). TLS handshake failure is a hard failure — no plaintext fallback.Implementation adds a
_fallback_on_refusalflag to_SessionSSLNegotiatingand extracts_start_ssl_negotiation/_proceed_to_connectedhelpers to share SSL setup code betweenSSLRequiredandSSLPreferred._CancelSenderis updated to fall back to plaintext cancel when usingSSLPreferred.Closes #81