avior is undefined (possible assertion trip). Reiterating the above outcome semantics: if the return value <code>N</code> indicates even 1 byte was sent, then this was successfully sent also. </td></tr>
    <tr><td class="paramname">payload_blob</td><td>The buffer to transmit. Reiterating the above outcome semantics: Either there is no error, and then the <code>N</code> returned will be 1+; or a truthy <code>Error_code</code> is returned either via the out-arg or via thrown <code>Runtime_error</code>, and i