@derickr said that `FAILURE` is defined as 1. If I'm reading the code correctly, it's possible for you to insert a single document and have `count` incremented from 0 to 1. If a `count` of 1 is returned, how can that be differentiated from `FAILURE`? Previously, you would have returned `SUCCESS` or `FAILURE`, depending on the `php_mongo_serialize_size()` return code.