public void serializeTo(IntBuffer buf, int precision) {
    buf.put(v, 0, getIntsPerElement(precision));
  }
Serialize this object to the given ByteBuffer, putting the required number
of ints for the given precision.

@param buf
         ByteBuffer to write values to
@param precision
         0 to 38. Decimal digits.
common/src/java/org/apache/hadoop/hive/common/type/UnsignedInt128.java