docs: public static PointsToPolyline create( @Nonnull ConfigPolyline config ) {
  		if( config instanceof ConfigSplitMergeLineFit ) {
  			return splitMerge((ConfigSplitMergeLineFit)config);
  		} else if( config instanceof ConfigPolylineSplitMerge ) {
  			return splitMerge((ConfigPolylineSplitMerge)config);
  		} else {
  			throw new RuntimeException("Unknown");
  		}
  	}