Custom grid margins (feature request)

[rolandtoth]

Hi,

would it be possible to set the margin as an array to allow setting different margins in one go?

So to use somethink like this for a right-margin only:

li
  cell(1, 4, g: (0 2rem 0 0))

Instead of this current workaround I'm using:

li
  cell(1, 4, g: 2rem)
  margin 0 2rem 0 0