es.
The default hash code represents only the identity of the object,
the same way as the default <a href="dart-ui/RRect/operator_equals.html">operator ==</a> implementation only considers objects
equal if they are identical (see <a href="dart-core/identityHashCode.html">identityHashCode</a>).</p>
<p>If <a href="dart-ui/RRect/operator_equals.html">operator ==</a> is overridden to use the object state instead,
the hash code must also be changed to represent that state.</p>
<p>Hash codes must be the same for 