@Override
	public void keyChanged(Field oldKey, Field newKey, FieldKeyNode childNode) throws IOException {
		keyChanged(oldKey, newKey.getBinaryData());
	}
Callback method for when a child node's leftmost key changes.
@param oldKey previous leftmost key.
@param newKeyData new leftmost key.
Ghidra/Framework/DB/src/main/java/db/FixedKeyInteriorNode.java