@Override
	public boolean isEquivalent(DataType dt) {
		return dt.getClass().equals(getClass());
	}
@return the data-type with the opposite signedness from this data-type. For example, this
        method on IntegerDataType will return an instance of UnsignedIntegerDataType.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/AbstractIntegerDataType.java