I believe it is possible to join water features in a way that would allow us to put a casing around them without lines where they are broken into smaller areas (e.g. long rivers).
I think it would perform okay on higher zooms.
Would this be cartographically desirable?
I am not sure is it the best way to fix this, but sometimes water features are nearly invisible - for example http://www.openstreetmap.org/?mlat=30.0577&mlon=78.5045#map=12/30.0577/78.5045 or http://www.openstreetmap.org/?mlat=50.09906&mlon=19.90122#map=19/50.09906/19.90122
Does #624 improve this?
The water examples from given locations are still not too visible.