39;s 0% chance explicit construction is any slower.</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * So, perf isn&#39;t an issue.  Still, why not make it aggregate-initializable though?  I (ygoldfel) gave up, eventually,</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * because I wanted *some* non-default-behavior constructors to be available, namely no-args (`Nati