* A data change event may be triggered spuriously, e.g. such that data before and after compare as equal.
* Implementations of this interface are expected to recover from such events. Event producers are expected to exert
* reasonable effort to suppress such events. In other words, it is completely acceptable to observe
* A data change event may be triggered spuriously, e.g. such that data before and after compare as equal.
* Implementations of this interface are expected to recover from such events. Event producers are expected to exert
* reasonable effort to suppress such events. In other words, it is completely acceptable to observe