Fails to correctly compare objects created by constructors from another realm (like iframes)
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- Dominant language
- JavaScript
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- 1.5k
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Description
This is definitely an edge-case, but when comparing objects like Array across iframe boundaries, instanceof will not work. See MDN's example of this: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray#instanceof_vs_isArray
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Research direction
No file or test is named in the issue. Start by locating the comparison logic that uses instanceof, then reproduce the MDN cross-iframe Array example with objects from another realm. Done means deep equality correctly compares those cross-realm constructed objects without relying on same-realm instanceof checks.
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Assessment
- Tech stack
- javascript
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100