Separate coastline & border ways
At [n31641025][1] two ways branch out southwards:
1. [w376216775][2] is a coastline-hugging boundary that's not marked `natural=coastline`.
2. [w22744974][3] is a coastline that is not marked as a boundary.
I'm guessing the two should be merged, but I just want to confirm it first.
[1]: https://www.openstreetmap.org/node/31641025#map=19/32.36390/-117.07076
[2]: https://www.openstreetmap.org/way/376216775
[3]: https://www.openstreetmap.org/way/22744974