>> There no warnings for `foo', surely?
> Yes there is, to stop warning we have to write `foo\\=', same for
> e.g. "don't do this" we need "don\\='t do this" to avoid warnings.
If you bump into such a warning, please report it as a bug.
+1
Also I believe that almost all of such instances were already fixed when the curved quotes feature went in (few years back).