Totality of inherited TypedDict keys is not respected

[a-gardner1]

🐛 Bug report

One more TypedDict-related issue: totality of TypedDicts is not respected when inherited, which can lead to spurious expectations of required or optional arguments by the argument parser.

The problem is that the TypedDict.__required_keys__ attribute is ignored by jsonargparse. For additional context, see python/cpython#83015 and python/cpython#17214.

I have gone ahead an opened a PR (#597) with a suggested fix.

To reproduce

from jsonargparse import ArgumentParser
import pytest

class BottomDict(TypedDict, total=True):
    a: int

class MiddleDict(BottomDict, total=False):
    b: int

class TopDict(MiddleDict, total=True):
    c: int

parser.add_argument("--middledict", type=MiddleDict, required=False)
parser.add_argument("--topdict", type=TopDict, required=False)
# the following should (but does not) raise an ArgumentError about missing required keys
with pytest.raises(ArgumentError) as ctx:
    parser.parse_args(['--middledict={}'])
ctx.match("Missing required keys")
with pytest.raises(ArgumentError) as ctx:
    assert {"b": 2} == parser.parse_args(["--middledict={'b': 2}"])["middledict"]
ctx.match("Missing required keys")
# the following should not (but does) raise an ArgumentError about missing required keys
assert {"a": 1, "c": 2} == parser.parse_args(["--topdict={'a': 1, 'c': 2}"])["topdict"]

Expected behavior

The assertions should evaluate to true.

Environment

• jsonargparse version: 4.32.1
• Python version: 3.11.6
• How jsonargparse was installed: pip
• OS: Ubuntu 20.04