Grid manual sizing not working with slds-grid--vertical

[mspeder]

Using manual sizing like slds-size--1-of-2 with slds-grid--vertical does not work.
Apparently slds-size--xxxx is implemented using width : xxxx which obviously does not work with column (should be height : xxxx in that case...).
Maybe a more generic approach using flex-basis : xxxx could solve the problem ?

[kaelig]

Closing this as vertical sizing in vertical grids isn't on the roadmap.