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Csd
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        buffer size reaches the low-water mark.

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        Conversely, resume_writing() is called when the buffer size is
        equal or lower than the low-water mark.  These end conditions
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        mark is zero.

        NOTE: This is the only Protocol callback that is not called
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Csd
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    factory to a utility function (e.g., EventLoop.create_connection()).

    When the connection is made successfully, connection_made() is
    called with a suitable transport object.  Then data_received()
    will be called 0 or more times with data (bytes) received from the
    transport; finally, connection_lost() will be called exactly once
    with either an exception object or None as an argument.

    State machine of calls:

      start -> CM [-> DR*] [-> ER?] -> CL -> end

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Csd
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Csd
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