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ok

ericlagergren/decimal · big.go:736

		ok = xc < maxMantissa || (xc&(xc-1)) == 0
	case x.exp > 0:
		f = float64(x.compact) * math.Pow10(x.exp)
		ok = x.compact < maxMantissa && !math.IsInf(f, 0) && !math.IsNaN(f)
	case x.exp < 0:
		f = float64(x.compact) / math.Pow10(-x.exp)
		ok = x.compact < maxMantissa && !math.IsInf(f, 0) && !math.IsNaN(f)
	default:
		parse = true
	}

	if parse {
		f, _ = strconv.ParseFloat(x.String(), 64)
		ok = !math.IsInf(f, 0) && !math.IsNaN(f)
	}

	if x.form&signbit != 0 {
		f = math.Copysign(f, -1)

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