Match return type of SerializationInfo.mode() to mode of model_dump() #1770
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Change Summary
Pydantic in some place use
Literal['python', 'json'] | str
for the serialization mode, using a more restrictive type can break stuff (e.g. typing validation). So this commit adapt the return type to make it matches with other pydantic valid serialization mode.Related issue number
Checklist
pydantic-core
(except for expected changes)