Method is_member

org/src/performant_fixed_set.rs:37–42

(&self, value: u32)

    }

    fn is_member(&self, value: u32) -> bool {
        let index = self.get_bucket_index(value);
        let bit_position = self.custom_bit_mapping(value);
        
        (self.buckets[index] & (1u128 << bit_position)) != 0
    }
}

fn benchmark_insert(total_elements: usize) -> std::time::Duration {