Got it working by replacing this

//converts the value to a js bool
function toBool(v) {
    if (Utilities.isNumber(v)) {
        return v > 0
    }
    if (Utilities.isString(v)) {
        return v === "true"
    }
    if (typeof v === "boolean") {
        return v
    }
    return false;
}

With

//converts the value to a js bool
function toBool(v) {
    if (typeof v === "number") {
        return v > 0
    }
    if (typeof v === "string") {
        return v === "true"
    }
    if (typeof v === "boolean") {
        return v
    }
    return false;
}