Decimal Functions and Operators

Operation	Result type precision	Result type scale
`x + y` and `x - y`	`min(38, 1 + min(xs, ys) + min(xp - xs, yp - ys) )`	`max(xs, ys)`
`x * y`	`min(38, xp + yp)`	`xs + ys`
	`min(38, xp + ys + max(0, ys-xs) )`	`max(xs, ys)`
`x % y`	`min(xp - xs, yp - ys) + max(xs, bs)`	`max(xs, ys)`