he native handle type (in POSIX, `int`), but this way is better stylistically with exactly zero performance</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> * overhead.  Initialize it, e.g., `Native_handle hndl(some_fd);`, where</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> * `some_fd` might be some POSIX-y FD (network socket, Unix domain socket, file descriptor, e