Hide vim cmdline -

i know little ocd, i've tricked out vim , tmux configs, i'm curious if it's possible collapse empty vim cmdline when not in use. sits there taking precious line of vertical real-estate!

from :help cmdheight:

'cmdheight' 'ch'        number  (default 1)                         global                         {not in vi} number of screen lines use command-line.  helps avoiding hit-enter prompts. value of option stored tab page, each tab page can have different value. 

set cmdheight argument must positive, no, it's not possible hide cmdline.