code: func (b *Generator) Bitset(idx uint) ([]byte, error) {
  	if b.nextSec != b.sections {
  		return nil, errors.New("bloom not fully generated yet")
  	}
  	if idx >= types.BloomBitLength {
  		return nil, errBloomBitOutOfBounds
  	}
  	return b.blooms[idx], nil
  }
docs: // Bitset returns the bit vector belonging to the given bit index after all
  // blooms have been added.