[OSM-dev] Shared borders of (multi) polygons represented as duplicated ways

[Paul Norman]

On 11/21/2014 10:09 AM, Stefan Baebler wrote:
> From the bugfix perspective it should probably be one more step of 
> merging (eg MergeWays()) after two prior merges (mergePoints() 
> and mergeWayPoints()).
Yes - and this shouldn't be too computationally expensive, as there 
aren't that many ways, at least compared to points.

The key is that any case where two ways are the same is that the objects 
either are the same or one will be converted into a multipolygon (i.e. 
has an inner)