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alias TCPOption

(alias) TCPOption = ("keepalive"|"linger"|"reuseaddr"|"tcp-nodelay"|"tcp-keepidle"|"tcp-keepcnt"|"tcp-keepintvl"|"tcp-defer-accept"|"tcp-fastopen"|"tcp-fastopen-connect"...)
    | "keepalive" -- Setting this option to `true` enables the periodic transmission of messages on a connected socket. Should the connected party fail to respond to these messages, the connection is considered broken and processes using the socket are notified;
    | "linger" -- Controls the action taken when unsent data are queued on a socket and a close is performed. The value is a table with a boolean entry `on` and a numeric entry for the time interval `timeout` in seconds. If the `on` field is set to `true`, the system will block the process on the close attempt until it is able to transmit the data or until `timeout` has passed. If `on` is `false` and a `close` is issued, the system will process the `close` in a manner that allows the process to continue as quickly as possible. I do not advise you to set this to anything other than zero;
    | "reuseaddr" -- Setting this option indicates that the rules used in validating addresses supplied in a call to bind should allow reuse of local addresses;
    | "tcp-nodelay" -- Setting this option to `true` disables the Nagle's algorithm for the connection;
    | "tcp-keepidle" -- value in seconds for `TCP_KEEPIDLE` **Linux only!!**
    | "tcp-keepcnt" -- value for `TCP_KEEPCNT` **Linux only!!**
    | "tcp-keepintvl" -- value for `TCP_KEEPINTVL` **Linux only!!**
    | "tcp-defer-accept" -- value for `TCP_DEFER_ACCEPT` **Linux only!!**
    | "tcp-fastopen" -- value for `TCP_FASTOPEN` **Linux only!!**
    | "tcp-fastopen-connect" -- value for `TCP_FASTOPEN_CONNECT` **Linux only!!**
    | "ipv6-v6only" -- Setting this option to `true` restricts an inet6 socket to sending and receiving only IPv6 packets.
The descriptions above come from the man pages.

😱 Types incomplete or incorrect? 🙏 Please contribute!