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    <p>I just came across <a moz-do-not-send="true"
        href="http://eel.is/c++draft/time.duration.io#4">[time.duration.io]p4:</a></p>
    <p>&gt; If <span class="texttt">Period<span class="operator">​::​</span>type</span>
      is <span class="texttt">micro</span>,
      but the character U+00B5 cannot be represented in
      the encoding used for <span class="texttt">charT</span>,
      the unit suffix <span class="texttt"><span class="literal">"us"</span></span>
      is used instead of <span class="texttt"><span class="literal">"μs"</span></span><a
        class="hidden_link"
        href="http://eel.is/c++draft/time.duration.io#4.sentence-1">.</a></p>
    <p>How is the determination as to whether the character can be
      represented to be done?  It seems this would involve consulting
      the locale.  Or is this effectively implementation defined
      behavior?</p>
    <p>Perhaps this is worth an LWG issue to at least clarify the
      behavior?<br>
    </p>
    <p>Tom.<br>
    </p>
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