Code style for variable_get() with integers?

Isn't it bad code style if i surround integers with quotes? This is out of D6 systems.module

  $form['admin_theme'] = array(
    '#type' => 'select',
    '#options' => $options,
    '#title' => t('Administration theme'),
    '#description' => t('Choose which theme the administration pages should display in. If you choose "System default" the administration pages will use the same theme as the rest of the site.'),
    '#default_value' => variable_get('admin_theme', '0'),
  );

  $form['node_admin_theme'] = array(
    '#type' => 'checkbox',
    '#title' => t('Use administration theme for content editing'),
    '#description' => t('Use the administration theme when editing existing posts or creating new ones.'),
    '#default_value' => variable_get('node_admin_theme', '0'),
  );

Looks better:

  $form['admin_theme'] = array(
    '#type' => 'select',
    '#options' => $options,
    '#title' => t('Administration theme'),
    '#description' => t('Choose which theme the administration pages should display in. If you choose "System default" the administration pages will use the same theme as the rest of the site.'),
    '#default_value' => variable_get('admin_theme', 0),
  );

  $form['node_admin_theme'] = array(
    '#type' => 'checkbox',
    '#title' => t('Use administration theme for content editing'),
    '#description' => t('Use the administration theme when editing existing posts or creating new ones.'),
    '#default_value' => variable_get('node_admin_theme', 0),
  );