code: func (r *RS) enableCache() {
  	if r.DataCnt < 29 && r.ParityCnt < 5 { // data+parity can't be bigger than 64 (tips: see the codes about make inverse matrix)
  		r.cacheEnabled = true
  	} else {
  		r.cacheEnabled = false
  	}
  }
docs: // At most 35960 inverse_matrix (when data=28, parity=4)