code: public static long[] andI(long[] v, long[] o) {
      int i = 0;
      for(; i < o.length; i++) {
        v[i] &= o[i];
      }
      // Zero higher words
      Arrays.fill(v, i, v.length, 0);
      return v;
    }
docs: AND o onto v in-place, i.e. v &amp;= o
  
  @param v Primary object
  @param o data to and
  @return v