Is there a way to know if a `counter()`

method has modified the counter value?

Or eventually the previous counter value?

Suppose there is a counter named `index`

that is initialized to `2`

, then we start decrementing it:

```
$bucket->counter('index', -1); // output 1, previous was 2, decremented of 1
$bucket->counter('index', -1); // output 0, previous was 1, decremented of 1
$bucket->counter('index', -1); // output 0, previous was 0, no decrement operation executed
```

How can we notice the difference between the last 2 `counter()`

operations?

Thanks