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Zero value of standard synchronization primitives like
sync.Mutex
andsync.WaitGroup
are valid. One may expect similar behavior fromcore.Fuse
, where it can be added as a struct field and used without additional initialization.This change makes
Fuse
a struct and updates the logic to allow using zero values. Unfortunately due to the change from interface to struct, the change is breaking (requires to remove the constructor or field type).