code: function BitArray(x, len, oct) {
    this.__bits = BitArray.parse(x, oct)
    this.__defineGetter__('length', function() {
      return this.__bits.length
    })
    len && this.fill(len)
    this.__len = len
  }
docs: BitArray constructor
  
  @param {Buffer} buffer of 32bit integers
  @param {Number} set length of bits
  @return {BitArray} new BitArray instance