overloads not properly evaluated with mypy 2.3.0 and numpy 2.5.1

Bug Report

The final reveal_type() below should show DatetimeArray, but it is showing Any

With pyright, ty and pyrefly, it produces the correct result. May be related to #21608

To Reproduce

import numpy as np
from typing import Any, Sequence, overload, reveal_type


class DatetimeArray:
    pass


class NumpyExtensionArray:
    pass


@overload
def array(  # pyright: ignore[reportOverlappingOverload]
    data: Sequence[np.datetime64],
) -> DatetimeArray: ...
@overload
def array(data: Sequence[Any]) -> NumpyExtensionArray: ...
def array(data: Sequence[Any]) -> DatetimeArray | NumpyExtensionArray:
    return (
        DatetimeArray() if isinstance(data[0], np.datetime64) else NumpyExtensionArray()
    )


foo1 = [np.datetime64("2026-01-05 23:27:59")]
foo0 = np.datetime64("2026-01-05 23:27:59")

reveal_type(foo0)
reveal_type(foo1)
reveal_type(array(foo1))  # Should be DatetimeArray

Expected Behavior

numpy_datetimearray.py:28: note: Revealed type is "numpy.datetime64[Any]"
numpy_datetimearray.py:29: note: Revealed type is "list[numpy.datetime64[Any]]"
numpy_datetimearray.py:30: note: Revealed type is "DatetimeArray"

Actual Behavior

numpy_datetimearray.py:28: note: Revealed type is "numpy.datetime64[Any]"
numpy_datetimearray.py:29: note: Revealed type is "list[numpy.datetime64[Any]]"
numpy_datetimearray.py:30: note: Revealed type is "Any"

Your Environment

• Mypy version used: 2.3.0
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.12
• Numpy version used: 2.5.1

L’issue non indica alcun file del repository né alcun test esistente. Inizia salvando il reproducer fornito ed eseguendolo con mypy 2.3.0, quindi traccia la valutazione degli overload per le due signature degli array e confronta il risultato con l’output reveal_type previsto. Il lavoro è completato quando la chiamata rivela DatetimeArray e un test di regressione copre questo caso.