Type Hint Issue with group_by Method

[CatBraaain]

I tried this code

pip install git+https://github.com/EntilZha/PyFunctional.git

from functional import seq
seq((1, 2), (2, 3)).group_by(lambda e: e[0]).filter(lambda e: len(e[1]) > 0)

mypy says

Argument 1 to "len" has incompatible type "Sequence[LogEntry]"; expected "Sized"

Imo, type hint of .group_by() is wrong and should be like as

     def group_by(
         self, func: Callable[[_T_co], _T]
-    ) -> Sequence[tuple[_T, Sequence[_T_co]]]:
+    ) -> Sequence[tuple[_T, list[_T_co]]]:

You can see the code of .group_by() method here.

PyFunctional/functional/pipeline.py

Lines 1075 to 1077 in d1b6479

	def group_by(
	self, func: Callable[[_T_co], _T]
	) -> Sequence[tuple[_T, Sequence[_T_co]]]:

But I'm not sure. Could anyone check this, please?