structuredClone coerces boxed primitives and flips false Boolean
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 68/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- javascript, react-native
- Domain
- mobile
Research direction
Start at the React Native structuredClone polyfill entry point and reproduce the behavior with boxed Number, String, Boolean, and Date values. Check that cloning reads the internal primitive without running user coercion hooks, preserves false Boolean values, and creates distinct wrappers; compare the result with native structuredClone.
Written by the indexing model from the issue text.
Description
Description
The React Native structuredClone polyfill reconstructs Number, String, Boolean, and Date wrappers by passing the source object to a constructor. Number/String cloning invokes user coercion hooks, and new Boolean(new Boolean(false)) uses object truthiness and silently changes the internal value to true.
Expected behavior
Cloning should read each wrapper's internal primitive through the built-in valueOf intrinsic, create a distinct wrapper with the same value, and never execute user coercion. Native structuredClone follows this behavior.
React Native Version
0.87.1 and current main
Affected Platforms
JavaScript runtime - All
- Dominant language
- C++
- Stars
- 127k
- Forks
- 25.3k
- PR merge metrics
- No merged PRs in 30d
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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