void setTXEntryOldValue(Object oldVal, boolean mustBeAvailable) {
    if (Token.isInvalidOrRemoved(oldVal)) {
      oldVal = null;
    } else {
      if (mustBeAvailable || oldVal == null || areOldValuesEnabled()) {
        // set oldValue to oldVal
      } else {
        oldVal = Token.NOT_AVAILABLE;
      }
    }
    retainAndSetOldValue(oldVal);
  }
The size the new value contributes to a pr bucket. Note if this event is not on a pr then this
value will be 0.
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java