`types.FunctionType` is missing `kwdefaults` from the constructor

[sobolevn]

Feature or enhancement

cpython/Objects/funcobject.c

Lines 800 to 813 in a9574c6

	@classmethod
	function.__new__ as func_new
	code: object(type="PyCodeObject *", subclass_of="&PyCode_Type")
	a code object
	globals: object(subclass_of="&PyDict_Type")
	the globals dictionary
	name: object = None
	a string that overrides the name from the code object
	argdefs as defaults: object = None
	a tuple that specifies the default argument values
	closure: object = None
	a tuple that supplies the bindings for free variables
	Create a function object.

It is rather strange to have defaults, but not kwdefaults.
I propose adding kwdefaults as the last parameter.

Linked PRs

• gh-112640: Add kwdefaults parameter to types.FunctionType.__new__ #112641

[Gobot1234]

Should it also have type_params?

[sobolevn]

I don't think that setting __annotations__ and __type_params__ is common enough.
I think that using .__annotations__ = ... and .__type_params__ = ... can solve this. However, __kwdefaults__ is different, because it comes in pair with __defaults__ which is already present.