@Override
  public CachePerfStats getCachePerfStats() {
    // return this.cache.getCachePerfStats();
    return cachePerfStats;
  }
Starting in 3.5, we don't check to see if the value is {@code Serializable}. We instead rely on
the actual serialization (which happens in-thread with the put) to tell us if there are any
problems.
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java