It depends wildly on how one defines "slightly". If it overflows in the editor, then that's a problem IMO. But some people would say no. In PHP we often see this type of thing:

  $someArr = [
    'config' => [
      'system' => 'linux',
      ...
     ],
  ];

Versus:

  $someArr =
    [
      'config' =>
        [
          'system' => 'linux',
          ...
        ],
    ];

Well... option 2 uses both significantly more vertical space, and horizontal space. But it's technically PSR compliant. However, we really need standard formatting on this, because it's annoying.