Apparently it's going to be called bitwriter (see the bottom of this post http://brettterpstra.com/2016/02/12/marked-2-dot-5-4-updates-fixes-and-improvements/ h

Apparently it's going to be called bitwriter (see the bottom of this post http://brettterpstra.com/2016/02/12/marked-2-dot-5-4-updates-fixes-and-improvements/ http://brettterpstra.com/2016/02/12/marked-2-dot-5-4-updates...) but there's not much information out there yet.