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Greptile P2 on PR #3247: `new Array(top.length)` creates a sparse array. If a future injected clusterFn doesn't cover every input index, topicOf[i] would be undefined, which then silently poisons the phase-1 aggregates (topicSize[undefined] / topicMax[undefined]) and degrades the topic sort without any observable failure. Fill with -1 so absence is unambiguous, then validate after clusterFn runs and throw if any index is still -1. The outer try/catch captures the error and returns {reps: top, topicCount: top.length, error} matching the existing contract — primary order is preserved, no crash. No behavior change today: singleLinkCluster's union-find guarantees every index is covered. This just guards the invariant for future clusterFn injections.