exp/lighthorzon: Add a generic, thread-safe `SafeSet`.#4572

Merged

Shaptic merged 2 commits intostellar:lighthorizonfrom Shaptic:lighthorizon_genericSafeSet

Sep 2, 2022

+60-30

Commits on Sep 1, 2022

Add generic, thread-safe SafeSet[T].
Shaptic
committed

Commits on Sep 2, 2022

Hide set since it needs an initializer
Shaptic
committed