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          <td class="paramtype">void *&#160;</td>
          <td class="paramname"><em>opaque</em>&#160;</td>
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          <td>)</td>
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<p>Default numeric comparator: a&lt;b ? -1 : a&gt;b ? +1 : 0. Interprets keys as unsigned 64-bit (via uintptr_t). </p>

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