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MSC3904: Room version 10 as a default

Enough time has passed to allow the public federation to upgrade their servers to support room version 10, though with some caveats (see "potential issues"). This proposal aims to make v10 the default room version.

Proposal

The specification adopts v10 as the suggested default room version, making no changes to the stability of any room versions. As of writing, v9 is currently the suggested room version.

Room version 10 is currently published here: https://spec.matrix.org/v1.4/rooms/v10/

Potential issues

Servers will be encouraged to update their config/internal defaults to use v10 instead of v9. This is considered a good problem to have.

Note that servers are not required to honour the default room version due to it being a suggestion in the specification, however they might fall behind as other servers set their defaults accordingly.

Some server implementations, like Synapse, support configurable default room versions: servers which have set this flag will not necessarily be affected by this change.

As of writing (2022-10-09) Synapse and Dendrite both have supported Room version 10 since 2022-08-02 when Synapse in 1.64.0 added its support. Dendrite added its support back in 2022-06-01. This leaves Conduit as the only major implementation to lack v10 support.

Conduit status for v10 is not implemented as of (2022-10-09) but has been reported that its getting close by Conduit developer Timo. Ruma has it implemented and the Catalyst Conduit fork has v10 working for about as long as Synapse has had its implementation based on the memory of the Author of this MSC.

For completeness, some links:

Conduit:

Tracking issue: N/A
Library support: https://github.com/ruma/ruma/pull/1213
Release: v0.5.0
Testing: N/A
Update Progress Source: https://gitlab.com/famedly/conduit/-/merge_requests/444/diffs?commit_id=1e1a144dfa98429ef9f02d16045796b73013830d

Alternatives

None relevant.

Security considerations