Flyte enables production-grade orchestration for machine learning workflows and data processing created to accelerate local workflows to production.

Flyte

I am using data classes with mashumuro discriminators, as in

```@dataclass(kw_only=True)
class CustomConfig(DataClassJSONMixin):

    class Config(BaseConfig):
        discriminator = Discriminator(
            field="type",
            include_subtypes=True,
        )

@dataclass(kw_only=True)
class MyCustomConfig(CustomConfig):
    type: str = "my_custom"

    foo: int

@dataclass(kw_only=True)
class MyOtherCustomConfig(CustomConfig):
    type: str = "my_other_custom"

    bar: int

@dataclass(kw_only=True)
class MainConfig(DataClassJSONMixin):
    custom_config: CustomConfig```

I am getting a key error when I use the MainConfig type in Flyte workflow

It is a key error if I have the discriminator as:

type: str = "my_custom"

If I instead use

type = "my_custom"

Then it is an invalid value error.

does it work if you remove `kw_only=True` ?