Description

(Changing a discussion to an issue, since it is fairly straightforward)

From python, calling a Consumer's commit function with parameters set to None (or other python False values) will resolve as boolean true in Consumer.c's checks, so instead of disregarding them, the function returns different errors.

How to reproduce

The issue can be seen when calling one of these:

consumer.commit(message=None)
consumer.commit(offsets=None)
consumer.commit(message=None, offsets=None)

But as a note:

kwargs = {'async': False }
consumer.commit(**kwargs)

and

consumer.commit(asynchronous=False)

work as expected.

Additionally

I suspect this is the line where it happens, but am not familiar:
https://github.com/confluentinc/confluent-kafka-python/blob/master/src/confluent_kafka/src/Consumer.c#L468C12-L468C12