Non null ContinuationToken json but null token value

When querying with pagination for partitioned collection, for the last page, the pagination token is not null, but the token field is null. e.g.,

```json
{"token":null,"range":{"max":"05C1D9CD673398","min":"05C1C9CD673398","isMinInclusive":true,"isMaxInclusive":false}}
```

Does above token indicate it's already the last page? Though in my case, it's actually the last page, besides the whole json itself is not null.

Similar issue here:
https://stackoverflow.com/a/51868733

The explanation was:
_"As for why the SDK does not just give a json null value for the continuation token: The SDK has reached the end for a given partition but mstill needs to visit other partitions to know for sure that there are no more documents that match your filter / need to be returned to the client."_

But it's unclear whether should the user treat this as last page. @aliuy
Any help?