Preserve sparse array length in structuredClone - #58209
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Summary:
The structured-clone polyfill initializes array results at length zero, so sparse arrays with trailing holes are shortened. Initialize the clone at the source length before recursively copying enumerable keys, preserving both holes and declared length.
Fixes #58208.
Changelog:
[GENERAL] [FIXED] - Preserve sparse array length and trailing holes in structuredClone.
Test Plan:
1.structuredClone.yarn flow-check: 0 errors.git diff --checkpassed.No UI change; screenshots are not applicable.