Impl DifferentialObserver for ValueObserver and RefCellValueObserver #3426
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Description
Adding impls for
DifferentialObserver
forValueObserver
andRefCellValueObserver
.I don't see a reason for these impls to not be present, but I'm also neither the author of
DifferentialObserver
norValueObserver
/RefCellValueObserver
, so I may have missed something.Checklist
./scripts/precommit.sh
and addressed all comments