Save a little more space by sub-ordering within the same index
Save a little more space by sub-ordering within the same index

to put the lowest-numbered endpoint last
within lines that start at the same point,
since that is the one that might come next.

mapbox/tippecanoe,landsurveyorsunited/tippecanoe,mapbox/tippecanoe,mapbox/tippecanoe,mapbox/tippecanoe,landsurveyorsunited/tippecanoe,joykuotw/tippecanoe,joykuotw/tippecanoe