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Hi community, I’m currently working on the <https://github.com/flyteorg/flyte/pull/5858|PR> supporting superset matching in Union Types (the <https://github.com/flyteorg/flyte/issues/5489#issuecomment-2332993567|goal>). I noticed an issue where, if default values aren’t specified for `Optional` fields, they are marked as required in the generated JSON schema. After investigating, I found that in Python, `Optional` means a field can be `None` or a specified type, but it still requires a value when creating the class. Therefore, the generated JSON schema will mark them as required. Since determining if a field is required is crucial for checking if they are in superset relationships, would it be reasonable to require a default value for `Optional` fields while using the superset match?  Or maybe there are any better solutions?
cc <@U05FFAF4FC2> <@U04664Z7H37> <@UNR3C6Y4T> <@U07JLUBCNFN>

Currently this works
```# upstream
@dataclass
class A:
    a: int

# downstream
@dataclass
class A:
    a: int
    b: Optional[str] = None```


Is this related to this proposal <https://github.com/flyteorg/flyte/issues/5887> by <@UNW4VP36V> ?

since we are using json schema to compare different dataclass

Commented one small concern about this <https://github.com/flyteorg/flyte/pull/5858#issuecomment-2451962272|here>. Maybe the concern is void, curious what you think :pray:

I updated some information on the PR descriptions and discussion. Please feel free to check it out, provide advice, or review the code!