hollow-diff-ui/src/tools/java/com/netflix/hollow/diff/ui/HistoryUITest.java [170:185]:
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            writer.writeDelta(baos_v2_to_v3);
            writer.writeReverseDelta(baos_v3_to_v2);

            // v4
            stateEngine.prepareForNextCycle();
            stateEngine.addHeaderTag(CUSTOM_VERSION_TAG, "v4");
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 1, 18 });  // 0
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 2, 7 });   // 1
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 3, 19 });  // 2
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 6, 12 });  // 3
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 15, 13 }); // 4
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 8, 10 });  // 5
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 18, 10 }); // 6
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 28, 90 }); // 7
            stateEngine.prepareForWrite();
            ByteArrayOutputStream baos_v4 = new ByteArrayOutputStream();
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hollow-diff-ui/src/tools/java/com/netflix/hollow/diff/ui/HistoryUITest.java [326:341]:
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            writer.writeDelta(baos_v2_to_v3);
            writer.writeReverseDelta(baos_v3_to_v2);
            stateEngine.prepareForNextCycle();

            // v4
            stateEngine.addHeaderTag(CUSTOM_VERSION_TAG, "v4");
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 1, 18 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 2, 7 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 3, 19 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 6, 12 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 15, 13 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 8, 10 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 18, 10 });
            addRec(stateEngine, schema, new String[] { "a1", "a2" }, new int[] { 28, 90 });
            stateEngine.prepareForWrite();
            ByteArrayOutputStream baos_v4 = new ByteArrayOutputStream();
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