pydantic_extra_types.pendulum_dt.DateTime and pendulum.DateTime are not compatible for mypy

[SinTh0r4s]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

We have to use pydantic_extra_types.pendulum_dt.DateTime to use pendulum.DateTime objects in pydantic dataclasses as a workaround, but mypy does not accept a pendulum.DateTime object for a (pydantic) dataclass with a pydantic_extra_types.pendulum_dt.DateTime object. This is not working with the mypy plugin enabled:
pyproject.toml:

[tool.mypy]
plugins = [
  "pydantic.mypy"
]

Example Code

import pendulum
from pydantic.dataclasses import dataclass
from pydantic_extra_types.pendulum_dt import DateTime


@dataclass(config={"strict": True})
class Example:
    datetime: DateTime


instance = pendulum.DateTime(1970, 1, 1)

# Works fine, but mypy throws [args-type]
Example(datetime=instance)
# scratch.py:14: error: Argument "datetime" to "Example" has incompatible type "pendulum.datetime.DateTime"; expected "pydantic_extra_types.pendulum_dt.DateTime"  [arg-type]

Python, Pydantic & OS Version

pydantic version: 2.8.2
        pydantic-core version: 2.20.1
          pydantic-core build: profile=release pgo=true
                 install path: C:\Users\redacted\AppData\Local\pypoetry\Cache\virtualenvs\navkpi-analysis-VIN2uGlr-py3.12\Lib\site-packages\pydantic
               python version: 3.12.3 (tags/v3.12.3:f6650f9, Apr  9 2024, 14:05:25) [MSC v.1938 64 bit (AMD64)]
                     platform: Windows-10-10.0.19045-SP0
             related packages: mypy-1.11.1 pydantic-extra-types-2.9.0 typing_extensions-4.12.2
                       commit: unknown

[forana]

FWIW, pyright has the same issue. Here's a workaround:

datetime: Annotated[pendulum.DateTime, pendulum_dt.DateTime]

That gets it past both type-checkers and is still functional.

[mrisher]

Thanks @forana those squiggly lines have been annoying me for months! Is there a reason not to upstream this into the pydantic_extra_types library (e.g. create a type we can use that automatically incorporates the Annotated block)?