open(filename, "rt") in textual.css.stylesheet.Stylesheet.read should be open(filename, "rt", encoding="utf-8")

[python-and-fiction]

After I write chinese comments in CSS file which is encoded in utf-8, my program won't work.
It outputs:

I noticed that open(filename, "rt") in textual.css.stylesheet.Stylesheet.read without encoding, and it use cp936 as encoding by default.
So I write a patch in my program:

import os
from textual.css.stylesheet import Stylesheet, CssSource
from pathlib import PurePath
from textual.css.errors import StylesheetError
def read(self, filename: str | PurePath) -> None:
    """Read Textual CSS file.

    Args:
        filename: Filename of CSS.

    Raises:
        StylesheetError: If the CSS could not be read.
        StylesheetParseError: If the CSS is invalid.
    """
    filename = os.path.expanduser(filename)
    try:
        with open(filename, "rt", encoding="utf-8") as css_file:
            css = css_file.read()
        path = os.path.abspath(filename)
    except Exception:
        raise StylesheetError(f"unable to read CSS file {
                              filename!r}") from None
    self.source[(str(path), "")] = CssSource(css, False, 0)
    self._require_parse = True
Stylesheet.read = read

Maybe maintainer can change it.
Is there any problem?

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