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why is esc_html() returning nothing given a string containing a high-bit character?

In PHP 5.2, filter_var() sanitizes text. In WP, esc_html() sanitizes text. The former works with a high-bit character in the text string, e.g. à , but the latter doesn't. esc_html seems to be ...
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1
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1answer
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How Could I sanitize the receive data from this code

<form id="tellastory" method="post" action=""> <label for="fullname">Full Name </label> <input id="fullname" name="fullname" type="text" maxlength="255" value=""/> ...