- don't use getRSMResponse anymore: rsm.PubSubClient use a different signature which return items and RSMResponse, this is better than the previous method as if the requested don't call getRSMResponse, there is no memory leak anymore.
- use RSMResponse directly instead of using ext_data, as other extension (like MAM) will be probably be managed with an other workflow
- don't do a useless deep copy of pubsub.PubSubRequest._parameters on each instance anymore
- RSMResponse.parse do now manage parsing of <set/> element directly
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