fix: rounding negative away from zero when half (#873)

src/filters/math.ts

@@ -15,5 +15,7 @@ export function round (v: number, arg = 0) {
   v = toNumber(v)
   arg = toNumber(arg)
   const amp = Math.pow(10, arg)
-  return Math.round(v * amp) / amp
+  const scaled = v * amp
+  // Round half away from zero
+  return Math.sign(v) * Math.round(Math.abs(scaled)) / amp
 }