re inserted
in, and iteration happens in first-to-last insertion order.</p>
<p>The elements of a <code>LinkedHashSet</code> must have consistent <a href="dart-core/Object/operator_equals.html">Object.==</a>
and <a href="dart-core/Object/hashCode.html">Object.hashCode</a> implementations. This means that the <code>==</code> operator
must define a stable equivalence relation on the elements (reflexive,
symmetric, transitive, and consistent over time), and that <code>hashCode</code>
must be the same for object