advanced coastline mappaint style

[Klumbumbus]

I was thinking about displaying the sides of a coastline in the mapview because errors in the coastline can cause big rendering issues. (We also have such renderings for cliff, embankment, kerb, retaining_wall.) Possible solutions could be:

• blue right-casing and brown left casing
• image pattern with waves at the right side

However we already have validator warnings for coastlines and I do not know if an advanced paint style would be distracting. Coastlines are also often together with boundaries and landuse borders. Since I do not have experience with coastline mapping, I'm not sure if it would be helpful or painful. Any opinions?

Example:

Code for this:

way[natural=coastline] {
    width: 1;
    color: water#0000ff;
    right-casing-width: 2;
    right-casing-color: water#0000ff;
    right-casing-offset: -1;
    left-casing-width: 2;
    left-casing-color: brown;
    left-casing-offset: -1;
}