For doors or windows the cutout will be the same as or smaller than the object. However, for a gate this could be different. I therefore tried M0,0 v1.1 h1.1 v-1.1 z in beta 11, but got a normal M0,0 v1 h1 v-1 z cutout.

I suppose relative values exceeding 1 may not even be valid in SVG (?)

ok
(just curious)