Neil Alexander c28f00bf96
Sync notifier tweaks (#2327)
* Micro-optimisations, lock fixes

* Refactor `SharedUsers`

* Reuse map to reduce allocations/GC pressure

* oh yeah, initialise it

* Leave room for the user ID we'll no doubt append afterward
2022-04-06 15:04:41 +01:00
..
2022-04-06 15:04:41 +01:00
2021-01-08 16:59:06 +00:00