importing and exporting multiple roles at one time

When exporting multiple roles at one time, the array produced repeats $roles['role'] multiple times. When importing these, since the array key 'role' is overwritten multiple times, the module only imports the last role in in the list. I believe that when the dump is created, the array key should increment. something like $role[0] then $role[1] so when the foreach loop in the import function runs, it will process all of the roles provided.