Negative rounding up is not consistent

[manoharanamphora]

When using numbro(12.455).format({mantissa:2});, it returns "12.46". However, for negative numbers like numbro(-12.455).format({mantissa:2});, it returns "-12.45" instead of "-12.46", which should be the expected rounded value.

[BenjaminVanRyseghem]

Here is how JS works:

Math.round(1245.5) // 1246
Math.round(-1245.5) // -1245