fix: preserve source when removing nested values

[nrps9909]

Summary

• clone the nested container before removeIfUndefined deletes its leaf
• preserve the input object and a new reference along the changed path
• add a regression assertion for both immutability and child identity

Why

internalSet cloned the root, but the deletion branch still mutated the original nested container through the shared clone[path] reference. Consumers that compare previous and next nested values can consequently miss the removal. This is the underlying cause reproduced from ant-design/ant-design#59044.

Verification

• exact regression failed on current master: the source object lost its nested light property
• full test suite: 29 suites passed, 182 tests passed, 1 skipped
• cross-package rc-field-form preserve suite: 13/13 passed with this local build; the added reproduction fails with the released util
• tsc --noEmit
• ESLint (0 errors; 6 existing unused-disable warnings)
• Prettier check
• father build
• git diff --check

AI assistance disclosure: Codex was used to trace the mutation, reproduce the downstream behavior, implement the focused fix, and run the checks above. All behavior and results were verified locally.

Summary by CodeRabbit

• Bug 修复
  • 修复删除嵌套属性时可能直接修改原对象的问题。
  • 现在会返回更新后的新对象，同时保留原对象及其嵌套数据不变。
  • 支持对象和数组中的嵌套属性安全删除。

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 259eeb0f-fcaf-4caa-8437-3b48344c0cdc

📥 Commits

Reviewing files that changed from the base of the PR and between d1045f4 and 29a9884.

📒 Files selected for processing (2)

• src/utils/set.ts
• tests/utils.test.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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Walkthrough

删除未定义的嵌套属性时，internalSet 先复制目标对象或数组，再删除属性并写回。测试验证源对象不变，且返回对象使用新的嵌套引用。

Changes

嵌套属性不可变删除

Layer / File(s)	Summary
复制嵌套值并验证不可变更新 src/utils/set.ts, tests/utils.test.ts	internalSet 在删除属性前复制嵌套对象或数组。测试验证源对象保持不变，并确认返回对象中的嵌套对��不是源对象引用。

Estimated code review effort: 2 (简单) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 29a98

This localized change preserves the source object and nested child identity when removing undefined values, with regression coverage and standard checks passing; no actionable merge-blocking risk remains.

Poem

小兔看见副本先生成

嵌套属性随后安静消失
源对象仍保持原样
新对象承载新的引用
胡萝卜为不可变更新鼓掌

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了主要变更：删除嵌套值时保留源对象。标题简洁、明确，并与代码和测试变更一致。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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