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@Yenthe666 Changing signatures of private functions has always been an accepted way to bugfix at Odoo - it's public signatures that we normally don't want to change. I would advise to use *args and **kwargs when extending those, if you want to code resiliently.
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@Yenthe666 And ideally to always use a kwarg to avoid arguments positioning issue in case of a bugfix that would introduce a positioned arg.