Exposed View: force single shows multi-select form element

I have a number of exposed filters on a single view. All of them only allow a single element to be selected, using force single.

Was expecting this to change the size of the exposed filter options to size="0" if Force Single is set. Making it a single dropdown select instead of multi-select form item. Looks like the size is being calculated based on the number of elements somewhere...

Expecting this:

To be this:

Thanks!