for a .pyi like

import pandas as pd

s: pd.Series[str]
s += "a"

, Pyrefly reports

`+=` is not supported between `Series[str]` and `Literal['a']`
  Expected `__iadd__` to be a callable, got `str`

This is accepted by mypy, pyright, basedpyright, and ty.

I'm guessing this has to do with there not being a Series.__iadd__ method in the stubs, causing Pyrefly to incorrectly prioritize Series.__getattr__ (which returns a str) over Series.__add__.

Used versions:

• pyrefly==0.50.0
• pandas==2.3.3
• pandas-stubs==2.3.3.260113