Hover over type alias does not work with Callable

[pwinston]

Environment data

• VS Code version: 1.45.1
• Extension version: 2020.5.86806
• OS and version: macOS 10.15.3
• Python version: 3.8.1
• Type of virtual environment used: conda
• Jedi or Language Server?: Language Server
• Value of the python.languageServer setting: Microsoft

Expected behaviour

Hover over type alias shows the definition.

Actual behaviour

When I hover over Type1 in steps below it just shows Type1.

Steps to reproduce:

New Python file type in:

from typing import Callable, Dict, List, Tuple, Type, Union
Type1 = Callable[[str], str]
Type2 = Dict[str, str]
Type3 = List[str]
Type4 = Tuple[str, str]
Type5 = Union[str, int]

Type1

Hover over the bottom Type1 it just shows Type1:

But if you choose "peek definition" it has full information:

All other types work (Dict, List, Tuple, Untion) but not Callable.

[MikhailArkhipov]

It is known issue. Typings is specialized in code and Callable needs to be implemented, see #535