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Document allowNullableNull change. #8115

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Document allowNullableNull change. #8115

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4 changes: 4 additions & 0 deletions en/appendices/5-3-migration-guide.rst
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Expand Up @@ -27,6 +27,10 @@ Validation

- The signature of ``Validator::validate(array $data, bool $newRecord = true, array $context = [])`` has now a additional third parameter ``$context``.
It can be used to pass necessary context into the validation when marshalling.
- The ``existsIn`` validation rule now defaults ``allowNullableNulls`` to ``true`` instead of ``false``.
This means that ``null`` values in nullable foreign keys will pass validation by default, which is more
semantically correct for optional relationships. If you need the previous behavior where ``null`` values
fail validation, you can explicitly set ``allowNullableNulls`` to ``false`` in your validation rules.

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