The tailscale article 
https://tailscale.com/blog/netaddr-new-ip-type-for-go/ mentions a finalizer 
trick. 

The SetFinalizer docs says the finalizer of an object is not guaranteed to 
be run. So the tailscale trick is valid, could I think that an object is 
not collected for sure if it has a finalizer and the finalizer has not run 
yet?




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