DOMRect normalizes NaN and negative zero to zero

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
65/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
javascript, react-native
Domain
mobile

Research direction

Locate the shared numeric conversion used when constructing DOMRectReadOnly and in mutable DOMRect setters. Check how omitted or nullish values are defaulted, then verify that supplied NaN and negative zero retain their values while only the intended defaults become zero.

Written by the indexing model from the issue text.

Description

Needs: Author Feedback Needs: Repro
Description

The shared numeric conversion used by DOMRectReadOnly construction and mutable DOMRect setters defaults all falsy values to 0. Valid NaN is therefore replaced with zero and -0 loses its sign.

Expected behavior

Only omitted/nullish optional values should receive the zero default. Supplied numeric values should undergo normal Number conversion while preserving NaN and signed zero.

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

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