_deserialize() got an unexpected keyword argument 'partial'

[passitalong]

I am getting an error of "_deserialize() got an unexpected keyword argument 'partial'" when I attempt to deserialize with Marshmallow.

  File "/Users/seanhoward/.virtualenvs/MegaTronWeb/lib/python3.9/site-packages/marshmallow/fields.py", line 365, in deserialize
    output = self._deserialize(value, attr, data, **kwargs)
TypeError: _deserialize() got an unexpected keyword argument 'partial'

MA2 appears to require **kwargs be added to all custom serialize/deserialize functions.

see: (marshmallow-code/marshmallow#1286)

I changed _serialize and _deserialize to include , **kwargs and it appears to be working.

class ArrowField(fields.Field):
    """
    An isoformatted datetime string.

    Arrow objects are converted to and from isoformatted strings
    by `Schema.dump` and `Schema.load` respectively.
    """

    default_error_messages = {
        'invalid_object': 'Invalid arrow object.',
        'invalid_datetime': 'Unable to parse datetime.',
    }

    def _serialize(self, value, attr, obj, **kwargs):
        if value is None:
            return None

        return value.isoformat()

    def _deserialize(self, value, attr, data, **kwargs):
        if not value:
            raise self.fail('invalid_object')

        try:
            return arrow.get(value)
        except arrow.parser.ParserError:
            raise self.fail('invalid_datetime')