{"id":"multi-leader-custom-merge-requires-merge-fn","text":"Constructing a cluster with `CUSTOM_MERGE` strategy and `merge_fn=None` is accepted silently, but raises `TypeError` at the first actual conflict during `sync()`","truth_value":"OUT","source":"entries/2026/05/29/multi-leader-replication-multi_leader-MultiLeaderCluster.md","source_url":"","source_hash":"","justifications":[],"dependents":["multi-leader-convergence-reliable-across-topologies"],"metadata":{"_retracted":true},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"multi-leader-custom-merge-requires-merge-fn","truth_value":"OUT","reason":"retracted premise"}]}}