FA-75325 / CRDT convergence / Member archive

Delete set normalization: touching ranges are not merged · case 05

Two ranges that meet end to start stay separate, so encodings differ between replicas.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

A delete set is a list of [client, clock, length] ranges, possibly unsorted, overlapping or adjacent. Normalize per client in client order: sort by clock and merge ranges that overlap or touch. Queries [client, clock] report whether the clock lies in a merged range (end exclusive). Return merged ranges and query answers.

Why this case matters

Sequence CRDTs ship deletions as compact range sets that every replica must normalize identically.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
adjacent ranges merge	`{"hits": [true, false], "ranges": [[1, 0, 2], [1, 2, 3]]}`	`{"hits": [true, false], "ranges": [[1, 0, 5]]}`	Failed

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