TypedDict totality ignored when unpacked for function call

Bug Report

When unpacking a typeddict for a function call, mypy doesn't seem to check the totality of the typeddict, and instead assumes the keys are all present.

from typing import TypedDict

def my_function(foo: int, bar: int, baz: str) -> None:
    pass

class MyTypedDict(TypedDict, total=False):
    foo: int
    bar: int
    baz: str
    
    
a: MyTypedDict = {'bar': 1}

my_function(**a) # Should be error here, as a doesn't contain foo or baz

https://mypy-play.net/?mypy=latest&python=3.10&flags=strict&gist=5444e1100000a8f1678fe9cbcfc23921

Expected Behavior

Mypy should not assume that keys are present when the TypedDict has total=False, and treat it as potentially having any combination of they keys present.

Actual Behavior

Mypy allows this, but when executed it gives the following error:

Traceback (most recent call last):
  File "<path>\typeddict1.py", line 17, in <module>
    my_function(**a)  # Should be error here, as a doesn't contain foo or baz
TypeError: my_function() missing 2 required positional arguments: 'foo' and 'baz'

#11753

まず、issue またはその mypy-play リンクにある total=False の TypedDict アンパッキング例を再現し、次に TypedDict のアンパッキングに対する関数呼び出し引数のチェックを追跡します。オプショナルキーが欠落する可能性がある場合に mypy がエラーを報告し、必須キーについて有効な動作が維持されれば完了です。