{"id":"bloom-filter-union-count-overestimates","text":"`BloomFilter.union()` sets `_count = self._count + other._count`, which overstates distinct items when filters share elements; `estimate_count()` from bit density is more accurate for unioned filters","truth_value":"IN","source":"entries/2026/05/29/bloom-filter-bloom_filter.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"bloom-filter-union-count-overestimates","truth_value":"IN","reason":"premise"}]}}