{"id":"cbf-count-tracks-calls-not-cardinality","text":"`CountingBloomFilter.__len__` returns `add` calls minus `remove` calls, not distinct element count; adding the same item twice and removing once leaves `len == 1`","truth_value":"IN","source":"entries/2026/05/29/bloom-filter-bloom_filter-CountingBloomFilter.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"cbf-count-tracks-calls-not-cardinality","truth_value":"IN","reason":"premise"}]}}