subprocess.Popen on windows cannot use default handles for stdin/stdout/stderr when some of them are redirected

Bug report

Bug description:

suppose I want to run a subprocess with piped stdin/stdout but let that process print to console using stderr (which is a common use pattern)
currently in Popen there's no way to override stdin=PIPE, stdout=PIPE but let stderr use default handle

if I have a child.py script:

import sys, time
try:
    print('console message', file=sys.stderr)
except Exception as e:
    open('CONOUT$', 'w').write(str(e))
while True:
    time.sleep(1)

and parent.py script:

import subprocess
with subprocess.Popen(('python.exe', 'child.py'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, creationflags=subprocess.CREATE_NEW_CONSOLE):
    pass

then it works if parent script is run in a console. But if it is a GUI script (e.g. run via pythonw.exe) then child script attempting to print to stderr gets [Errno 22] Invalid argument
this happens because this line:
https://github.com/python/cpython/blob/067145177975eadd61a0c907d0d177f7b6a5a3de/Lib/subprocess.py#L1398
tries to inherit stderr, but it returns None in a GUI app, so then a fake Pipe is created and ultimately passed to CreateProcess as stderr instead of NULL handle.

Here's a hack which allows me to selectively pipe only stdin and stdout and leave stderr as default:

import subprocess

class HackedSTARTUPINFO(subprocess.STARTUPINFO):
    def __setattr__(self, attr, value):
        if attr == 'hStdError':
            value = None
        super().__setattr__(attr, value)

    def copy(self):
        return self

si = HackedSTARTUPINFO()
with subprocess.Popen(('python.exe', 'child.py'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, startupinfo=si, creationflags=subprocess.CREATE_NEW_CONSOLE):
    pass

This way child.py can print to stderr even if run from a GUI script.

There should be a way to selectively set STARTUPINFO.hStdInput/hStdOutput/hStdError to None using Popen arguments.

CPython versions tested on:

3.10

Operating systems tested on:

Windows

Bắt đầu tại Lib/subprocess.py, quanh dòng được liên kết 1398, và tái hiện trường hợp parent.py/child.py trên Windows bằng pythonw.exe và CREATE_NEW_CONSOLE. Được xem là hoàn tất khi Popen có thể pipe stdin và stdout trong khi để stderr một cách có chọn lọc dưới dạng handle mặc định, kể cả khi parent là một script GUI.