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Thibault Saunier authored Nov 16, 2021 and Tim-Philipp Müller committed Nov 20, 2021

Since python 3.10 implicit conversion to integers using `__int__` as
been completely removed (was deprecated behavior in 3.9) so we need
to cleanly handle it now.

See https://gitlab.gnome.org/GNOME/pitivi/-/issues/2589

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