docs: private void checkForHashCodeChange(Entry<K, V> e) {
      K key = extractKeyObj(e);
      if (extractIntKeyValue(key, modifiedHash(key.hashCode())) != e.hashCode) {
        if (keyMutationCnt ==  0) {
          getLog().warn("Key mismatch! Key hashcode changed! keyClass=" + e.getKey().getClass().getName());
          String s;
          try {
            s = e.getKey().toString();
            if (s != null) {
              getLog().warn("Key mismatch! key.toString(): " + s);
            }
          } catch (Throwable t) {
            getLog().warn("Key mismatch! key.toString() threw exception", t);
          }
        }
        keyMutationCnt++;
      }
    }