Series.apply callable result might not be hashable

It's possible for the callable in Series.apply to return something
non-hashable like a list, but the result of apply should still be a
Series.

Author: danielroseman

pandas-stubs/core/series.pyi

@@ -685,7 +685,7 @@ class Series(IndexOpsMixin, NDFrame, Generic[S1]):
     @overload
     def apply(
         self,
-        func: Callable[..., Hashable],
+        func: Callable[..., Scalar | Sequence | Mapping],
         convertDType: _bool = ...,
         args: tuple = ...,
         **kwds,

tests/test_series.py

@@ -398,6 +398,11 @@ def retseries(x: float) -> float:
 
     check(assert_type(s.apply(retseries).tolist(), list), list)
 
+    def retlist(x: float) -> list:
+        return [x]
+
+    check(assert_type(s.apply(retlist), pd.Series), pd.Series, list)
+
     def get_depth(url: str) -> int:
         return len(url)