PydanticAI 发布 v2.47.0：兼容性调整与多项修复
原标题：v2.47.0 (2026-09-21)
AI 摘要
PydanticAI 发布 v2.47.0 版本，主要包含兼容性调整、新功能与多项 bug 修复。兼容性方面，将 None 输出路由命名为 None 而非 NoneType，并在 UserPromptPart.content 非字符串或序列时抛出错误而非静默发送字典键。新功能方面，TypeSafeModel 新增支持三种字段类型。此外修复了 tuple 输出字段、rubric 层级、None 路由识别等多项问题，并将 ag-ui-protocol 依赖固定为小于 1 的版本。
正文节选
<!-- Release notes generated using configuration in .github/release.yml at main --> ## What's Changed ### ⚠️ Compatibility Notes * Name a `None` output route `None` rather than `NoneType` by @DouweM in https://github.com/pydantic/pydantic-ai/pull/8590 * Raise when `UserPromptPart.content` is not a `str` or a sequence, instead of silently sending a `dict`'s keys by @DouweM in https://github.com/pydantic/pydantic-ai/pull/8595 ### 🚀 Features * Ask three more field types `TypeSafeModel` can already