pub const ExtensionType = enum(u16) {
    /// RFC 6066
    server_name = 0,
    /// RFC 6066
    max_fragment_length = 1,
    /// RFC 6066
    status_request = 5,
    /// RFC 8422, 7919
    supported_groups = 10,
    /// RFC 8446
    signature_algorithms = 13,
    /// RFC 5764
    use_srtp = 14,
    /// RFC 6520
    heartbeat = 15,
    /// RFC 7301
    application_layer_protocol_negotiation = 16,
    /// RFC 6962
    signed_certificate_timestamp = 18,
    /// RFC 7250
    client_certificate_type = 19,
    /// RFC 7250
    server_certificate_type = 20,
    /// RFC 7685
    padding = 21,
    /// RFC 8446
    pre_shared_key = 41,
    /// RFC 8446
    early_data = 42,
    /// RFC 8446
    supported_versions = 43,
    /// RFC 8446
    cookie = 44,
    /// RFC 8446
    psk_key_exchange_modes = 45,
    /// RFC 8446
    certificate_authorities = 47,
    /// RFC 8446
    oid_filters = 48,
    /// RFC 8446
    post_handshake_auth = 49,
    /// RFC 8446
    signature_algorithms_cert = 50,
    /// RFC 8446
    key_share = 51,

    _,
}