Let's say that an entity have the following constraints applied to a property:

/*
 * @Assert\NotBlank(
 *     message="The username cannot be blank."
 * )
 * @Assert\MinLength(
 *     limit=2,
 *     message="The username must have at least {{ limit }} characters."
 * )
 * @Assert\Regex(
 *     pattern="/^[a-z][a-z0-9\-_]+$/i",
 *     message="The username must start with a letter and can contain alphanumerical characters, -, and _."
 * )

When a form validates the propery:

• If the property is blank, the min length and regex constraints are not applied
• If the property is not blank but the the min length constraint fails, the regex constraint is still applied, resulting in two errors

I understand that this was the desired default behaviour, but for some use cases one would want to halt on first failure.
I remember that symfony1.x had the halt_on_error option for this, though I couldn't found any reference to achieve this in symfony2.

Is this an undocumented feature? or is this still not implemented?