Hi, all.
I want to write type hints without worrying about runtime overhead.
Current best practice is:
```
from __future__ import annotations
import typing
if typing.TYPE_CHECKING:
import xxx # modules used only in type hints.
```
But it would be nice if I can avoid importing even "typing" module.
How about adding TYPE_CHECKING builtin that is False?
```
from __future__ import annotations
if TYPE_CHECKING:
from typing import Any, Optional
# We can use Any, Optional, etc here.
```
I wonder if we can make TYPE_CHECKING constant like True, False, and None.
But it will break existing `from typing import TYPE_CHECKING` codes.
Regards,
--
Inada Naoki <songofaca...@gmail.com>
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