FA-75158 / CRDT convergence / Member archive

Formatting mark spans: a negative start indexes from the end of the text · case 03

A range beginning before the text formats characters at the end of the document.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

A text of `length` characters receives ["bold"|"unbold", start, end, stamp] operations over half-open ranges clamped to the text. Each character takes the operation with the largest stamp (counter, replica) covering it; it is bold when that operation is "bold". Return maximal bold spans as [start, end) pairs in order.

Why this case matters

Rich-text CRDTs must resolve overlapping formatting operations identically regardless of arrival order.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
range starting before the text is clamped	`[[0, 2], [9, 11]]`	`[[0, 2]]`	Failed

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