Improve multiple selection tag value display - show value and unset count

In JOSM if you select multiple objects the display of tag values is different to iD. For example it will say:

• <1 'value', 2 unset>
• <2 different, 1 unset>
• <3 different>

Whereas in iD it will just say "Multiple Values" and even when there is an unset tag value. Instead with three selected ways tagged lit=no, lit=yes and no lit tag, it could say for example:

• 2 values, 1 unset

At the very least it would be good to have the numbers of each value in brackets in the dropdown, along with an "unset" value if there is an object without a value.