containsHash(hash) {
    if (this.numEntries === 0) return false
    for (let probe of this.getProbes(hash)) {
      if ((this.bits[probe >>> 3] & (1 << (probe & 7))) === 0) {
        return false
      }
    }
    return true
  }
Tests whether a given SHA-256 hash (given as hex string) is contained in the Bloom filter.