notation overwrite warnings

I am getting a lot of warnings like these:

```Warning: Notation _ = _ was already used in scope type_scope.
[notation-overridden,parsing]
Warning: Notation _ ≠ _ was already used in scope type_scope.
[notation-overridden,parsing]
```

If there is a way to avoid these, short of totally disabling notation overriding warnings globally? 
