Error while returning job result. | Object of type IntermediateValue is not JSON serializable

[rinarakaki]

Describe the bug
I'm trying to create a streaming handler. I yield a pydantic model for each iteration:

from pydantic import BaseModel

class IntermediateValue(BaseModel):
    ...

def handler:
    for i in range(10):
        yield IntermediateValue(...)

start({"handler": handler})

When run locally there's no problem serialising pydantic model, but deployed and run on the remote serverless environment, it issues errors. Do you have any idea what causes this error?

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Expected behavior
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