a.scale = 0
		return true
	case a.scale == 0:
		c, ok := int64Multiply(a.value, b)
		if !ok {
			return false
		}
		a.value = c
	case a.scale > 0:
		c, ok := int64Multiply(a.value, b)
		if !ok {
			return false
		}
		if _, ok = positiveScaleInt64(c, a.scale); !ok {
			return false
		}
		a.value = c
	default:
		c, ok := int64Multiply(a.value, b)
		if !ok {
			return false
		}