code: func (r *Reader) ReadFloat32() float32 {
  	if r.err != nil {
  		return 0
  	}
  	var n int
  	n, r.err = io.ReadFull(r.rd, r.b[:4])
  	r.cnt += n
  	if r.err != nil {
  		return 0
  	}
  	bits := binary.LittleEndian.Uint32(r.b[:4])
  	return math.Float32frombits(bits)
  }
docs: // ReadFloat32 reads and returns a float32.