Suggestion: Walls and the Coastline

[Repentance7]

I've noticed that no matter how close I try to build a wall to the coastline, it never "seals off"...as in the walls don't stick close enough to the coastline that no mobs can get through. I can get past the wall by a weeeeeeeeeee little bit of space right at the edge of the coastline.Why do I propose this? Well some people (like me) like to have one side of their base camp backed against the ocean, so that side is guaranteed safe against mobs (unless Klei decides to release some sort of water expansion in the future). However, if mobs can still get past the wall by the coastline, then this kind of ruins the wall =\Any thoughts?