TypedDict silently accepts experimental PEP 728 arguments but ignores them

[decorator-factory]

For completely unknown TypedDict kwargs, pyright correctly shows an error:

class Foo(TypedDict, bar=True):
    #                ^^^^^^^^
    # TypedDict does not support __init_subclass__ parameter "bar
    x: int

However, it does not complain about closed and extra_items, even if enableExperimentalFeatures is not enabled.

from typing import TypedDict

class HasX(TypedDict, closed=True):  # no error reported
    x: int

class HasXY(TypedDict):
    x: int
    y: int

has_xy: HasXY = {"x": 1, "y": 2}
has_x: HasX = has_xy  # assignment is allowed

(the assignment is disallowed when enableExperimentalFeatures is on)

It makes it seem like these flags are supported, but they are silently ignored. I expected an error message like

PEP 728 support is experimental. Set enableExperimentalFeatures to true to enable it

---

Pyright version: 1.1.394

Python version: 3.12