QMetaObject::indexOfMethod(const char*);

    index = metaobject.indexOfMethod(b"destroyed")
ValueError: 'PySide6.QtCore.QMetaObject.indexOfMethod' called with wrong 
argument values:   PySide6.QtCore.QMetaObject.indexOfMethod(b'destroyed',)
Found signature:
  PySide6.QtCore.QMetaObject.indexOfMethod(bytes)

It seems that indexOfMethod (and perhaps also the other indexOf methods) is broken. 

When passing the name as bytes, it throws a ValueError, when passing the name as str it just returns -1.

Example should make it obvious.

Cheers!

UPDATE: Was error on my side. The misleading Exception message could still be fixed.