silverstripe/silverstripe-framework — pull request #2530 by xini (2013-10-12 23:19:34+00:00)
Title: BUGFIX: make sure the option is selected if value and label are 0

$this->value is stored as string internally. In the special case that
the option value is 0, the type comparison fails to resolve 0 == '0',
see http://www.php.net/manual/en/types.comparisons.php