// if converted to a *big.Rat.
func smallInt(x *big.Int) bool {
	return x.BitLen() < maxExp
}

// smallFloat64 reports whether x would lead to "reasonably"-sized fraction
// if converted to a *big.Rat.
func smallFloat64(x float64) bool {
	if math.IsInf(x, 0) {
		return false
	}
	_, e := math.Frexp(x)
	return -maxExp < e && e < maxExp
}