Updating latest events is sensitive to event ordering

[kegsay]

This may or may not be a problem, but there is no prose to suggest it has been thought about.

calculateLatest which works out forward extremities only looks at the oldLatest then switches them out for new events... if you get events out of order we'll grow the forward extremities indefinitely.

[neilalexander]

In theory we should probably produce some glue events automatically if the number of extremities reaches a certain number, but I don't know if it's really happening in practice anymore — the highest number of forward extremities on d.m.org across all 3600 rooms is 5 apparently.