Unable to use MultiValueEnum with pydantic>=2.7

[somnam]

Hi,

After bumping pydantic to 2.7 version I've noticed that it's not possible to instantiate a Pydantic class having an attr of type aenum.MultiValueEnum.

Pydantic detects only the canonical value and raises a validation error when given other accepted values.

An example Model definition:

from pydantic import BaseModel
from aenum import MultiValueEnum

class MultiEnum(MultiValueEnum):
    NAME = "VAL", "value"

class SomeModel(BaseModel):
    attr: MultiEnum

When using canonical value VAL the model is created:

SomeModel(attr="VAL")
SomeModel(attr=<MultiEnum.NAME: 'VAL'>)

When using other value the model fails:

SomeModel(attr="value")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/pysetup/.venv/lib/python3.11/site-packages/pydantic/main.py", line 175, in __init__
    self.__pydantic_validator__.validate_python(data, self_instance=self)
pydantic_core._pydantic_core.ValidationError: 1 validation error for SomeModel
attr
  Input should be 'VAL' [type=enum, input_value='value', input_type=str]
    For further information visit https://errors.pydantic.dev/2.7/v/enum

Could this problem be resolved by a fix in the aenum package or would it require action from Pydantic maintainers?