Clearing a custom Field or setting it to zero

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I am currently working with Contact custom fields with SOAP (using the zeep library in Python)

I'd like to update a custom field to the IntegerValue of 0. Unfortunately, this doesn't seem to be possible : I get an error that reads "Expected IntegerValue for property x"

I'm assuming that a value of 0 is equivalent to "no value". Fair enough, I'd be okay with clearing the value of that field instead of setting it to zero. But can't seem to do that either.

 

Anyone faced the same issue ?

Thanks !