error: Argument 1 to "astype" of "Series" has incompatible type "dtype[generic] | ExtensionDtype"; expected "type[object] | ExtensionDtype" [arg-type]

[randolf-scholz]

Describe the bug

Series.dtype is incompatible with Series.astype

To Reproduce

import pandas as pd

s = pd.Series([1, 2, 3])
s = s.astype(s.dtype)  # ✘ [arg-type]

Please complete the following information:

• OS: Ubuntu 22.04
• python version 3.10
• mypy 1.4.1
• pandas 2.0.3
• pandas-stubs 2.0.2.230605

[Dr-Irv]

I think if we replace

pandas-stubs/pandas-stubs/_typing.pyi

Line 195 in 8d5a827

| ExtensionDtype

with DtypeObj (and move the definition of DtypeObj above AstypeObj, then this error would get fixed.