add "Wait Until Page Does Not Contain" keyword

I can see that "Wait Until Page Does Not Contain Element" and "Wait Until Element Is Not Visible" were recently added by @molsky and @deiga. Would it be possible that someone adds the "Wait Until Page Does Not Contain" keyword? 

(note that I realise that currently I can do a Wait until keyword succeeds  10s  1s  Page Should Not Contain)
