Is anyone running gtk4 is D?

[aberba]

I'm building a UI component library on top of gtk3 to aid and 
building good looking UI faster with few lines of code. Currently 
using Gtk-d (gtk3)

I know there's a gtk4 branch somewhere but doesn't seem to have 
gained much improvement a while now. I would much rather prefer 
going with the newest version of gtk, v4, rather than the soon to 
be phased out, v3

Is anyone able to use gtk4 in D?