@Override
		public int hashCode() {
			return System.identityHashCode(this);
		}
<code>MyIdentityHashMap</code> extends {@link HashMap} with the only difference being its 
implementation of {@link #hashCode()} and {@link #equals(Object)} which are based purely on 
the map instance identity and not its content.
<p>
This unique implementation was created due to the use of this map as a key within another
{@code Map}.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/datatypes/DataTypeMergeManager.java