$gel-grid-enable--box-sizing: true; not enough for the grid

[dagda1]

I have the following main.scss:

$gel-grid-enable--markup-output: true;
$gel-grid-enable--box-sizing: true;

@import '~gel-sass-tools/sass-tools';
@import '~sass-mq/mq';
@import '~gel-grid/grid';

But the grid does not render correctly like this.

I have to add the universal box-sizing in order for the sizing to work correctly:

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}

Is there something else I am missing in order to get this to work without adding additional styles?