[DerekNonGeneric]

Requested by DerekNonGeneric · project thread

Review only. Do not merge. This replays the already-merged #105 (commit 682eaae against its parent) so CodeRabbit can review it, because it hit its rate limit when #105 was open and it refuses to review closed PRs. Findings will be fixed in a separate PR against main, and this PR will be closed.

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Summary by CodeRabbit

• Bug Fixes
  • Deep merges now apply source objects in order, including repeated sources, and only merge into the target’s own properties.
  • Circular references are preserved separately for each existing destination, and shared objects retain their relationships when copied.
  • Plain objects created in other realms are copied consistently, whether nested directly or inside arrays. Objects such as dates are not mistakenly treated as plain objects.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: fd995fde-12bb-43e4-831a-3d4353e552dc

📥 Commits

Reviewing files that changed from the base of the PR and between b554adf and 682eaae.

📒 Files selected for processing (8)

• .changeset/fair-graphs-stay-local.md
• packages/util-array/src/_internal/_copy-deep.ts
• packages/util-array/test/helpers/copy-array.ts
• packages/util-core/src/_internal/_is-plain-object.ts
• packages/util-core/src/index.ts
• packages/util-object/src/_internal/_mixin.ts
• packages/util-object/src/guards/is-plain-object.ts
• packages/util-object/test/helpers/merge-graphs.ts

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📝 Walkthrough

Walkthrough

The changes add shared plain-object detection and use it in array copying and object guards. They also update deep-merge handling for repeated sources, inherited target properties, and cyclic object graphs, with tests and patch release entries.

Changes

Object graph copying and merging

Layer / File(s)	Summary
Shared plain-object detection packages/util-core/src/_internal/_is-plain-object.ts, packages/util-core/src/index.ts, packages/util-object/src/guards/is-plain-object.ts, packages/util-array/src/_internal/_copy-deep.ts, packages/util-array/test/helpers/copy-array.ts	util-core adds and exports _isPlainObject. isPlainObject and _copyDeep use the shared guard. Tests cover copying cross-realm objects and retaining a tagged Date by reference.
Merge graph handling packages/util-object/src/_internal/_mixin.ts, packages/util-object/test/helpers/merge-graphs.ts, .changeset/fair-graphs-stay-local.md	_mixin tracks active source-target pairs, reads only own target properties, and handles cached copies across destinations. Tests cover source precedence, inherited target values, cycles, and cross-realm objects. The changeset adds patch release entries for three packages.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 682ea

No identified regression requires a fix before merge; normal checks remain appropriate.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: limiting deep merges to each target's own object graph. It is concise and specific despite the decorative emojis.
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 7 files. (1 skipped: 1 u…
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.

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