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[Bug]: validation shouldn't fail when values contain array with null #822

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@wosc

Description

@wosc

Actual Behavior

This issue is somewhat similar to #551, only with a list in the input ({'names': [None]} instead of {'name': None}), and this time RecursionExceeded is raised instead of UnmarshallerError.

Expected Behavior

Should not raise an exception.

Steps to Reproduce

Here's a test case, modelled after the one in #555 (that fixed #551). This also shows that somehow the issue is limited to the 3.0 code path, because it works just fine with 3.1

    @pytest.mark.parametrize('factory', [
        oas30_write_schema_unmarshallers_factory,
        oas31_schema_unmarshallers_factory])
    def test_object_with_array_of_null(self, factory):
        schema = {}
        spec = SchemaPath.from_dict(schema)
        unmarshaller = factory.create(spec)
        result = unmarshaller.unmarshal({'foo': [None]})
        assert result == {'foo': [None]}

OpenAPI Core Version

0.19.0

OpenAPI Core Integration

pyramid-openapi3

Affected Area(s)

unmarshalling

References

No response

Anything else we need to know?

No response

Would you like to implement a fix?

No

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