Use medium- instead of large- in function zurb_foundation_preprocess_page

Hello!
Suggestion: why not use the medium breakpoint instead of the large in zurb_foundation.theme lines 294-309?
I believe that there is still room for having the sidebars aside of the main content on let's say an iPad in portrait orientation, now they are pushed down below the main, just as on a smartphone. That's because the large breakpoint is used. Here is the code with the medium replacing the large.

if (!empty($left) && !empty($right)) {
    $variables['main_grid'] = 'medium-6 medium-push-3';
    $variables['sidebar_first_grid'] = 'medium-3 medium-pull-6';
    $variables['sidebar_sec_grid'] = 'medium-3';
  }
  elseif (empty($left) && !empty($right)) {
    $variables['main_grid'] = 'medium-9';
    $variables['sidebar_first_grid'] = '';
    $variables['sidebar_sec_grid'] = 'medium-3';
  }
  elseif (!empty($left) && empty($right)) {
    $variables['main_grid'] = 'medium-9 medium-push-3';
    $variables['sidebar_first_grid'] = 'medium-3 medium-pull-9';
    $variables['sidebar_sec_grid'] = '';
  }
  else {
    $variables['main_grid'] = 'medium-12';
    $variables['sidebar_first_grid'] = '';
    $variables['sidebar_sec_grid'] = '';
  }

For me is was a bit hard to find that here is where I could change this behaviour.
Thanks for a great base theme!