bblanchon / django-phonenumber-field / 16758078580

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Fix lost region when `PHONENUMBER_DEFAULT_FORMAT` is `NATIONAL`

When `PHONENUMBER_DEFAULT_FORMAT` is set `NATIONAL`, you used to get a validation error after setting a `PhoneNumberField` to a phone number that is not in the default region.
This was because `PhoneNumberField` didn't override `to_python()`, so `CharField.to_python()` was called and returned `str(value)`.
Since `str(value)` returns a string in the `NATIONAL` format, the region information was lost.

I fixed this issue by overriding `to_python()` in  `PhoneNumberField`, ensuring that a `PhoneNumber` is returned.
This change forced me to move up the call to `super().get_prep_value()` because `CharField`'s implementation calls `self.to_python()`, which now returns a `PhoneNumber`.
This allowed me to remove `if isinstance(value, PhoneNumber)` in `get_prep_value()` since `value` is now always a `PhoneNumber`.

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