[developer92]

they need one to contribute changes though

[rad_gruchalski]

The system that implements breaking changes is not the open source system. The open source system attempts to be compatible with the proprietary system. That is what it sounds like.

[ZWoz]

They don't contribute changes. Server and official client is maintained by Stockholmsstad contractors. Open source project is alternative client, not full solution.

[LocalH]

They're changing their own code, not the public code in question. They're not submitting pull requests.