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I think you can do some cool things when you set classes. A colon : indicates 'else'.

{%
  set classes = [
    item.is_expanded ? 'is-expanded' : 'not-expanded',
    item.is_collapsed ? 'is-collapsed' : 'not-collapsed',
    item.in_active_trail ? 'active',
    item.below ? 'has-children': 'no-children
  ]
%}