context.putUserData(CURRENT_ACCESSORS_OF_UPGRADED_PROPERTIES, diff(
            currentAccessorsOfUpgradedProperties(currentUpgradedProperties),
            currentAccessorsOfUpgradedProperties(baselineUpgradedProperties)
        ));
        context.putUserData(OLD_REMOVED_ACCESSORS_OF_UPGRADED_PROPERTIES, diff(

    public static final String SEEN_OLD_REMOVED_ACCESSORS_OF_UPGRADED_PROPERTIES = "seenOldRemovedAccessorsOfUpgradedProperties";
    public static final String CURRENT_ACCESSORS_OF_UPGRADED_PROPERTIES = "currentAccessorsOfUpgradedProperties";

    public static List<UpgradedProperty> parse(String path) {
        File file = new File(path);
        if (!file.exists()) {
            return Collections.emptyList();
        }