I have faced the issue myself, so I created this custom Class to make it work.

function Decimal(val) {
    var dotPosition, sVal;
    if (val instanceof Decimal) {
        this.p = val.p, this.m = val.m;
    } else {
        sVal = Number(val).toString();
        this.p = 0, this.m = parseInt(sVal.replace('.', ''), 10);
        dotPosition = sVal.indexOf('.');
        if (dotPosition !== -1) {
            this.p = sVal.length - dotPosition - 1;
        }
    }
}
Decimal.prototype.valueOf = function () {
    return this.m / Math.pow(10, this.p);
};

Decimal.prototype.mul = function (val) {
    var a = new Decimal(this),
        d = new Decimal(val);
    a.p += d.p;
    a.m *= d.m;
    return a;
};

Decimal.prototype.toFixed = function (precision) {
    var a, radix;
    a = new Decimal(this);
    radix = Math.pow(10, a.p - precision);
    a.m = Math.round(a.m / radix);
    a.p = precision;
    return a;
};
var r = new Decimal(2.135);
console.log(2.135.toFixed(2), r.toFixed(2).valueOf()); //Outputs: 2.13 2.14

Uh oh!

Invalid values for math.round #316

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