Fixes DelayProcedure thread-safety (#616)
Fixes DelayProcedure thread-safety (#616)


blg-andreasbraun/Operations,ProcedureKit/ProcedureKit,danthorpe/Operations,danthorpe/Operations,blg-andreasbraun/ProcedureKit,blg-andreasbraun/ProcedureKit,blg-andreasbraun/ProcedureKit,blg-andreasbraun/Operations,blg-andreasbraun/Operations,danthorpe/Operations,ProcedureKit/ProcedureKit,ProcedureKit/ProcedureKit