public static List<UpgradedProperty> parse(String path) {
        File file = new File(path);
        if (!file.exists()) {
            return Collections.emptyList();
        }
        try (FileReader reader = new FileReader(file)) {
            List<UpgradedProperty> upgradedProperties = new Gson().fromJson(reader, new TypeToken<List<UpgradedProperty>>() {}.getType());
            // FIXME There should be no duplicates, yet there are some

			testWriteTo{fileOps{int64(1), "abc", int64(2), "defgh", int64(4)}, 15, errUnrefData},
			testRead{100, "", errUnrefData},
			testRemaining{0, 5},
		},
	}}

	for i, v := range vectors {
		var fr fileReader
		switch maker := v.maker.(type) {
		case makeReg:
			r := testNonEmptyReader{strings.NewReader(maker.str)}
			fr = &regFileReader{r, maker.size}
		case makeSparse: