Python 3.11.4 | packaged by conda-forge | (main, Jun 10 2023, 18:08:17) [GCC 12.2.0] on linux
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>>> from PySide6.QtCore import QByteArray, QIODevice, QDataStream
>>> buffer = QByteArray(1000, 0)
>>> buffer.resize(0)
>>> ds = QDataStream(buffer, QIODevice.WriteOnly)
>>> b = b'test'
>>> type(b)
<class 'bytes'>
>>> ds.writeRawData(b)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 'PySide6.QtCore.QDataStream.writeRawData' called with wrong argument values:
 PySide6.QtCore.QDataStream.writeRawData(b'test',)
Found signature:
 PySide6.QtCore.QDataStream.writeRawData(bytes)

Although the argument of writeRawData actually is <class 'bytes'>, it produces this odd error.