Method by

src/main/java/groovy/lang/IntRange.java:237–239

Creates a new NumberRange with the same from and to as this IntRange but with a step size of stepSize . @param stepSize the desired step size @return a new NumberRange @since 2.5.0

(T stepSize)

     * @since 2.5.0
     */
    public <T extends Number & Comparable> NumberRange by(T stepSize) {
        return new NumberRange(getFrom(), getTo(), stepSize, true, true); // GROOVY-10496
    }

    private void checkSize() {
        // size() in the Collection interface returns an integer, so ranges can have no more than Integer.MAX_VALUE elements