When a − b or b − a cannot be made (a kernel error, or a body that encloses no volume), the
region's volume and centre are null, measured_by is "not measured" and not_measured gives the
cut's error; its deviation, area, faces and box are still given, the side's total is null and
the verdict says the volume is not measured. The integrated-along-lines estimate is no longer
reported as a volume.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
jyvikoandClaude Opus 5.5
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