private synchronized boolean isRegionSynchronizeScheduledOrDone() {
    return regionSynchronizeScheduledOrDone;
  }
Canonicalize an ordered set of exceptions. In the canonical form, none of the RVVExceptions
have any received versions.

@return The canonicalized set of exceptions.
geode-core/src/main/java/org/apache/geode/internal/cache/versions/RegionVersionHolder.java