c++
			cdigit = 0
			cup = false
		}
		trimmed++
		// Remember trimmed digits of c
		c0 = c0 && cNextDigit == 0
		cNextDigit = int(cdigit)
		lower, central, upper = l, c, u
	}
	// should we round up?
	if trimmed > 0 {
		cup = cNextDigit > 5 ||
			(cNextDigit == 5 && !c0) ||
			(cNextDigit == 5 && c0 && central&1 == 1)
	}
	if central < upper && cup {
		central++
	}