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When defining a [`Union`](https://pydantic.dev/docs/validation/latest/concepts/types/#unions), include the most specific type first, followed by the less specific type. In the example below, the more specific `PlaneItem` comes before `CarItem` in `Union[PlaneItem, CarItem]`. |
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When defining a [`Union`](https://pydantic.dev/docs/validation/latest/concepts/unions/), include the most specific type first, followed by the less specific type. In the example below, the more specific `PlaneItem` comes before `CarItem` in `Union[PlaneItem, CarItem]`. |