 string <code>length</code> or an object to coerce to an integer to provide the
 index to check if an attempt to call <a href="#setValue(jakarta.el.ELContext,java.lang.Object,java.lang.Object,java.lang.Object)"><code>setValue(jakarta.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object)</code></a> with that index will always fail.</dd>
<dt>Returns:</dt>
<dd>If the <code>propertyResolved</code> property of <code>ELContext</code> was set to <code>true</code>, then
 <code>true</code> if calling t