code: public int copy(byte[] bytes, int at) {
          System.arraycopy(this.bytes, 0, bytes, at, this.length);
          return at + this.length;
      }
docs: Copy the contents of this kim to a byte array.
  
  @param bytes
  A byte array of sufficient size.
  @param at
  The position within the byte array to take the byes.
  @return The position immediately after the copy.