split: point the caret at the failing part of a SIZE

[sylvestre]

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[codspeed-hq]

Merging this PR will not alter performance

✅ 328 untouched benchmarks
⏩ 79 skipped benchmarks¹

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_{Comparing caret-split (d6fa077) with main (f2987b5)}

Footnotes

1. 79 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

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