[mkgmap-dev] Multiple bounds entries in osm file

Hi, while playing with the mkgmap-nod branch, I've found a small unexpected error. When I download multiple segments with the josm editor and save them in a single osm file then the file contains multiple 'bound' tags. When I process this file with mkgmap then only the last bound entry is considered. Wouldn't it be more reasonable that all bounds entries are considered? Or is there a reason, that the generated img has to be of rectangular outline?