Refine SimplePath to allow for os.PathLike on input and SimplePath on output.

Author: jaraco

docs/conf.py

@@ -71,6 +71,4 @@
     ('py:class', '_T'),
     # Other workarounds
     ('py:class', 'importlib_metadata.DeprecatedNonAbstract'),
-    # Workaround needed for #480
-    ('py:obj', 'importlib_metadata._meta._T'),
 ]

importlib_metadata/_meta.py

@@ -1,3 +1,6 @@
+from __future__ import annotations
+
+import os
 from typing import Protocol
 from typing import Any, Dict, Iterator, List, Optional, TypeVar, Union, overload
 
@@ -44,19 +47,19 @@ def json(self) -> Dict[str, Union[str, List[str]]]:
         """
 
 
-class SimplePath(Protocol[_T]):
+class SimplePath(Protocol):
     """
     A minimal subset of pathlib.Path required by Distribution.
     """
 
-    def joinpath(self, other: Union[str, _T]) -> _T:
+    def joinpath(self, other: Union[str, os.PathLike[str]]) -> SimplePath:
         ...  # pragma: no cover
 
-    def __truediv__(self, other: Union[str, _T]) -> _T:
+    def __truediv__(self, other: Union[str, os.PathLike[str]]) -> SimplePath:
         ...  # pragma: no cover
 
     @property
-    def parent(self) -> _T:
+    def parent(self) -> SimplePath:
         ...  # pragma: no cover
 
     def read_text(self, encoding=None) -> str: