[Form] Explain deprecation of @Assert\Date on DateTimeInterface fields #13998
Description
symfony/symfony#25015 gives this deprecation note:
DEPRECATION: Validating a \DateTimeInterface with "Symfony\Component\Validator\Constraints\Date" is deprecated since version 4.2. Use "Symfony\Component\Validator\Constraints\Type" instead or remove the constraint if the underlying model is already type hinted to \DateTimeInterface.
This fact should be explained at the corresponding Constraint pages, e.g. https://symfony.com/doc/current/reference/constraints/Date.html
Question: If you just rely on the ?\DateTimeInterface type-hint of the setter, and the user submits an invalid date in a form, how can you show a nice error message? What's the best practice here?