Fix inconsistent marker boundary order#19995

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arkflpc wants to merge 7 commits intomasterfrom

ck/19975-marker-boundary-order

Commits on Mar 23, 2026

Commits on Mar 26, 2026

Commits on Mar 30, 2026

Removed double markers sorting in data pipeline downcast. Code cleanup. Added more tests.
niegowski
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Commits on Mar 31, 2026

Replaced "opening", "closing" custom property values with "start", "end" to better reflect used terms.
niegowski
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Updated code comment.
niegowski
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