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Add section about backwards compatibility

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Signed-off-by: Tulir Asokan <tulir@maunium.net>
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Tulir Asokan 2019-11-04 21:14:18 +02:00
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proposals/2244-mass-redactions.md
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@ -17,6 +17,17 @@ It would be easiest to do this before MSC2174 is written into the spec, as then
only one migration would be needed: from an event-level redacts string to a
content-level redacts array.
### Backwards compatibility
There is no easy way to stay fully compatible with *older* clients, so the
proposed solution is to not support them. In order to not break old clients
completely, servers should still add a `redacts` string containing one of the
redacted event IDs to the top level of `m.room.redaction` events in *newer*
room versions when serving such events over the Client-Server API.
Like MSC2174, for improved compatibility with *newer* clients, servers should
add a `redacts` array to the `content` of `m.room.redaction` events in *older*
room versions when serving such events over the Client-Server API.
### Number of redactions
Room v4+ event IDs are 44 bytes long, which means the federation event size
limit would cap a single redaction event at a bit less than 1500 targets.