Undefined index: #name, #id, and #value on /checkout with PHP 5.3

For reference, making the following changes in form.inc also stops the warning.

line 1418 of form.inc in function theme_select
Before
return theme('form_element', $element, '<select name="'. $element['#name'] .''. ($multiple ? '[]' : '') .'"'. ($multiple ? ' multiple="multiple" ' : '') . drupal_attributes($element['#attributes']) .' id="'. $element['#id'] .'" '. $size .'>'. form_select_options($element) .'</select>');

After
return theme('form_element', $element, '<select name="'. (isset($element['#name']) ? $element['#name'] : '') .''. ($multiple ? '[]' : '') .'"'. ($multiple ? ' multiple="multiple" ' : '') . drupal_attributes($element['#attributes']) .' id="'. (isset($element['#id']) ? $element['#id'] : '') .'" '. $size .'>'. form_select_options($element) .'</select>');

line 1428 of form.inc in function form_select_options
Before
$value_is_array = is_array($element['#value']);

After
$value_is_array = is_array(isset($element['#value']) ? $element['#value'] : FALSE);
$value_is_array = isset($element['#value']) ? is_array($element['#value']) : FALSE;

Comments in the PHP manual regarding this issue:
http://www.php.net/manual/en/language.types.array.php#87713
http://www.php.net/manual/en/language.types.array.php#89425

See #815032: Weird form api usage in ec_store.inc for an explanation of why $element[#name] etc. aren't set in the $state_select array.
Summary: To get Drupal to render a JS select element so the JS select element will inherit the same styling as the other select elements.

The solution to the above issue was to add the following line to the $state_select array:
'#parents' => array('state_select'),

Gordon,

If you have time...

For reference, is there something that could be done differently in form.inc in (e.g.) Drupal 8?

I really like the way that you've done this.
I think the pattern(?) would be useful to people in general.

I'll mark this as fixed in 24 hours if you haven't.

Thank you.

Soren

Changing title back.