@function lists-are-same($item-a, $item-b) {
  @if (
    (type-of($item-a) == 'list' and type-of($item-b) != 'list') or
    (type-of($item-a) != 'list' and type-of($item-b) == 'list')
  ) {
    @warn 'deep-lists-are-same comparing list to non-list';
    @return false;
  }

  @if (type-of($item-a) == 'list') {
    @if ( length($item-a) != length($item-b) ) {
      @warn 'lists-are-same: length of lists are non-equal';
      @return false;
    }

    @for $i from 1 through length($item-a) {
      @if not lists-are-same(nth($item-a), nth($item-b)) {
        @return false;
      }
    }
  } @else {
    @if $item-a != $item-b {
      @warn 'list-are-same: #{$item-a} ain\'t #{$item-b}';
      @return false;
    }
  }

  @return true;
}