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## 1.33.3

**`(fix):`** 修复当可选文件字段未在 multipart form-data 请求中提供时出现的空指针解引用恐慌。生成的代码现在将可选二进制字段的 `WriteFile` 调用包装在空值保护中，与可选非文件正文属性的现有行为匹配。必需的文件字段保持无条件。