@Override
			public void modifyOriginal(ProgramDB program) throws Exception {
				DataTypeManager dtm = program.getDataTypeManager();

				Structure s =
					(Structure) dtm.getDataType(new CategoryPath("/Category1/Category2/Category3"),
						"IntStruct");
				s.setPackingEnabled(true);

				Union union =
					(Union) dtm.getDataType(new CategoryPath("/Category1/Category2"), "CoolUnion");
				union.setPackingEnabled(true);
			}
Data type merge tests for aligned data types.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/datatypes/DataTypeMerge6Test.java