Event Batching doesn't seem to be enabled by default

[wired9]

We have found that if a feature is a part of experiment, Optimizely sends a blocking API call to send an impression event every time a decision is made. Your doc here: https://docs.developers.optimizely.com/full-stack/docs/event-batching-ruby says that BatchEventProcessor is enabled by OptimizelyFactory.default_instance, however, an instance of ForwardingEventProcessor seem to be actually used.

We're using v3.6.0, upgrading to 4.0.0 shows the same.