Before a question is closed, the OP didn't know which users cast closevotes, unless they have left a comment. However, sometimes the OP would like to discuss about the closevote(s) with the closevoters. Feature request: Allow OP to ping closevoters in comments. E.g.
@closevoters blah blah.
For example, if the closevote was "unclear" but the OP doesn't see what is unclear, then the OP could ping the closevoters to ask what should be clarify.