How to close all IRC PMs at once in Weechat

UPDATE 2021-02-24

It seems like new-ish versions of weechat now need:

/allpv /close

In the interest of not making this clickbait I’ll lead with the command:

/allpv close

I find this very useful when some spammer hits an IRC network and opens hundreds of private messages.

You just run the above command in weechat and it closes every private message in one go.