Defines the most basic interface a class must implement to be normalizable.
If a normalizer is registered for the class and it doesn't implement the Normalizable interfaces, the normalizer will be used instead.
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normalize(NormalizerInterface $normalizer, string|null $format = null, array $context = array())
Normalizes the object into an array of scalars|arrays.
It is important to understand that the normalize() call should normalize recursively all child objects of the implementor.