NumberWidget is not a "Text field"

/**
 * Implements hook_field_widget_info().
 */
function number_field_widget_info() {
  return array(
    'number' => array(
      'label' => t('Text field'),
      'field types' => array('number_integer', 'number_decimal', 'number_float'),
    ),
  );
}

Hmm... maybe this is correct... perhaps it is trying to tell it is using a text field for numeric entry.

However maybe HTML5 makes this more complex because this uses Drupal\Core\Render\Element\Number... and that generates a <input data-drupal-selector="edit-field-ads-0-value" type="number" id="edit-field-ads-0-value" name="field_ads[0][value]" value="" step="1" placeholder="" class="form-number"> which is now a number input.

Committed 508bbb5 and pushed to 8.0.x. Thanks!