[next] fix: snapshot array length override fallback

[mathieuprog]

Use nullish coalescing so snapshot preserves an overridden array length of 0 instead of falling back to the source length

[changeset-bot]

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Latest commit: c0b4599

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[codspeed-hq]

Merging this PR will not alter performance

✅ 118 untouched benchmarks

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_{Comparing mathieuprog:next (c0b4599) with next (e1f3b56)}