I did this

curl example.com --tls-max 1.3 --libcurl -

I expected the following

  curl_easy_setopt(hnd, CURLOPT_SSLVERSION, CURL_SSLVERSION_MAX_TLSv1_3);

or possibly

  curl_easy_setopt(hnd, CURLOPT_SSLVERSION, CURL_SSLVERSION_DEFAULT | CURL_SSLVERSION_MAX_TLSv1_3);

What I actually got:

  curl_easy_setopt(hnd, CURLOPT_SSLVERSION, 458752L);

curl/libcurl version

curl 8.6.0 (aarch64-apple-darwin23.2.0) libcurl/8.6.0 (SecureTransport) OpenSSL/3.2.1 zlib/1.2.12 brotli/1.1.0 zstd/1.5.5 libidn2/2.3.7 libssh2/1.11.0 nghttp2/1.60.0 librtmp/2.3 OpenLDAP/2.6.7
Release-Date: 2024-01-31
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz MultiSSL NTLM SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd

operating system

Darwin [redacted] 23.4.0 Darwin Kernel Version 23.4.0: Wed Feb 21 21:44:06 PST 2024; root:xnu-10063.101.15~2/RELEASE_ARM64_T8103 arm64 arm Darwin