<em>sign</em> option is only valid for floating point and signed integer types,
and can be one of the following:</p>
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<tr class="row-odd"><th class="head"><p>Option</p></th>
<th class="head"><p>Meaning</p></th>
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<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'+'</span></code></p></td>
<td><p>indicates that a sign should be 