symfony/symfony — pull request #3078 by canni (2012-01-10 10:13:59+00:00)
Title: [BugFix][Validator] Fix for PHP incosistent behaviour of ArrayAccess

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: #2779
Todo: -

Because PHP function `array_key_exists` is buggy, it works great with native
PHP `ArrayObject` instances, but hand written implementations of `ArrayAccess`
and `Traversable` objects will fail to work with `CollectionValidator`

Tests from second commit are valid use cases, but without this change, they will fail.