handle nulls, which can impact performance.
 When it is known that values will not be null, it is recommended to use <a href="MultiValueAttribute.html" title="class in com.googlecode.cqengine.attribute"><code>MultiValueAttribute</code></a> instead.</div>
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<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Niall Gallagher</dd>
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