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MSC3589: Room version 9 as the default room version #3589

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13 changes: 8 additions & 5 deletions proposals/3589-v9-default-version.md
Original file line number Diff line number Diff line change
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# MSC3589: Room version 9 as a default

Enough time has passed to allow the public federation to upgrade their servers to support room
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version 9. This proposal aims to make v9 the default room version.
version 9, though with some caveats (see "potential issues"). This proposal aims to make v9 the
default room version.

## Proposal

Expand All @@ -23,18 +24,20 @@ in the specification, however they might fall behind as other servers set their
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 (Jan 18, 2022), some prominent server implementations are only just getting support for
As of writing (Jan 26, 2022), some prominent server implementations are only just getting support for
the room version. Namely, Dendrite released a version with support about 2 months ago and Conduit is
blocked behind a Ruma release with the changes otherwise landing also about 2 months ago.
working on including Ruma's changes which landed also about 2 months ago.

Though both Dendrite and Conduit (meaning Ruma) have not had the same amount of time as Synapse to
reach maturity on v9-capable versions, both the Dendrite and Conduit communities appear to update to
newer versions much more quickly. This implies, without statistics to back it up, that nearly all
Dendrite servers out there will have upgraded and that a similar percentage of Conduit servers will
upgrade once available.

No major issues appear to be reported to Synapse, Dendrite, or Ruma with respect to v9, indicating to
the author that the implementation is at least sane if a bit difficult to incorporate.
No major issues appear to be reported to Synapse or Dendrite with respect to v9, however Conduit
has [reported](https://gitlab.com/famedly/conduit/-/merge_requests/257#note_814327701) that the auth
rules for v9 might not be perfect. All of this indicates to the author that the implementation is at
least sane and accomplishable, even if a bit difficult to incorporate.
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For completeness, some links:

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