Documentation
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    ToClient:
        | { tag: "ToClientInit"; val: ToClientInit }
        | { tag: "ToClientClose"; val: ToClientClose }
        | { tag: "ToClientCommands"; val: ToClientCommands }
        | { tag: "ToClientAckEvents"; val: ToClientAckEvents }
        | { tag: "ToClientKvResponse"; val: ToClientKvResponse }
        | { tag: "ToClientTunnelMessage"; val: ToClientTunnelMessage }