Swizzle the string comparison so it's not pathological if input is presorted
Swizzle the string comparison so it's not pathological if input is presorted

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