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Edit: /opt/alt/python37/lib/python3.7/site-packages/jsons/serializers/default_union.py

from typing import Union

from jsons._common_impl import get_class_name, NoneType
from jsons._compatibility_impl import get_union_params
from jsons._dump_impl import dump
from jsons.exceptions import JsonsError, SerializationError

def default_union_serializer(obj: object, cls: Union, **kwargs) -> object:
    """
    Serialize an object to any matching type of the given union. The first
    successful serialization is returned.
    :param obj: The object that is to be serialized.
    :param cls: The Union type with a generic (e.g. Union[str, int]).
    :param kwargs: Any keyword arguments that are passed through the
    serialization process.
    :return: An object of the first type of the Union that could be
    serialized successfully.
    """
    sub_types = get_union_params(cls)

# Cater for Optional[...]/Union[None, ...] first to avoid blindly
    # string-ifying None in later serializers.
    if obj is None and NoneType in sub_types:
        return obj

for sub_type in sub_types:
        try:
            return dump(obj, sub_type, **kwargs)
        except JsonsError:
            pass  # Try the next one.
    else:
        args_msg = ', '.join([get_class_name(cls_)
                              for cls_ in get_union_params(cls)])
        err_msg = ('Could not match the object of type "{}" to any type of '
                   'the Union: {}'.format(type(obj), args_msg))
        raise SerializationError(err_msg)

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