code: public ByteVector putByte(final int b) {
          int length = this.length;
          if (length + 1 > data.length) {
              enlarge(1);
          }
          data[length++] = (byte) b;
          this.length = length;
          return this;
      }
docs: Puts a byte into this byte vector. The byte vector is automatically
  enlarged if necessary.
  
  @param b
  a byte.
  @return this byte vector.