Describe the issue:

Using divmod widens generic type of timedelta64. The last overload should probably use Self instead of timedelta64, or possible add an overload for the timedelta case.

Reproduce the code example:

from datetime import timedelta as TD
from typing import assert_type

import numpy as np

td = np.timedelta64(1, "D")
assert_type(td, np.timedelta64[TD])  # ✅

n, remainder = divmod(td, td)
assert_type(remainder, np.timedelta64[TD])  # ❌ timedelta64[timedelta | int | None]

Python and NumPy Versions:

2.2.2
3.13.1 (main, Dec 4 2024, 08:54:14) [GCC 11.4.0]

Type-checker version and settings:

mypy 1.4.1
pyright 1.1.393