I'm currently working on a legacy codebase that involves nested fields with the nullable=True parameter. In my review of the source code for Marshmallow version 3.21.1, I couldn't find any reference to this parameter. Is it possible that nullable=True is an outdated argument, and can I replace it with allow_none=True? Should I use it as metadata?
Marshmallow fields.Nested(...,nullable=True)
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