<p><a href="https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap07.html" rel="nofollow">https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap07.html</a>:</p>
<blockquote>
<p>cntrl<br>
Define characters to be classified as control characters.<br>
In the POSIX locale, <strong>no characters in classes alpha or print shall be included.</strong></p>
<p>In a locale definition file, <strong>no character specified for the keywords upper, lower, alpha, digit, punct, graph, print, or xdigit shall be specified.</strong></p>
</blockquote>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=3882389" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/pmatilai">@pmatilai</a> Maybe I'm missing something here, but what's an example of a UTF-8 multi-byte sequence which would fall within the <code>cntrl</code> set above (aka false positive) such that it <em>wouldn't also</em> cause a problem for the current code as well?</p>

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