proper default for filter: always

Also proper handling for making sure array is noted whether
array or a single value is passed.

Signed-off-by: Zeljko <zeljko@zwr.fi>
cleanup: comment unneccessary code

Signed-off-by: Zeljko <zeljko@zwr.fi>
cleanup unnecessary code and comments

Signed-off-by: Zeljko <zeljko@zwr.fi>