[Tagging] Dispute on highway=mini_roundabout

[Nathan Edgars II]

I've started tagging local mini_roundabouts with mountable=yes/no. Most 
have trees and are obviously not. But I'm not exactly sure where the 
line is. Should one with a low curb, more like a gutter, be considered a 
"true" mini-roundabout or not? For example, this one in Kissimmee: 
http://maps.google.com/maps?hl=en&ll=28.292105,-81.404818&spn=0.004204,0.008256&gl=us&t=m&z=18&layer=c&cbll=28.292041,-81.404739&panoid=USYkfOYkh2zXnjx-zCLrKQ&cbp=12,122.16,,0,9.06