JQuery does not take into account min when using step

I’ve been experimenting problems on minus button when value-step<min. I did those changes to solve it.

$('.woocommerce .quantity').on('click', '.minus', function (e) {
        var qty = $(this).parent().find('input.qty');
        var val = parseInt(qty.val());
        var step = parseInt(qty.attr('step'));//Modified
        var min = parseInt(qty.attr('min'));//Modifien

        if ('undefined' !== typeof (min) || val > min) {
            step = 'undefined' !== typeof (step) ? parseInt(step) : 1;

            if (val - step >= min) {//Modified
                qty.val(val - step).change();
            }
        }
    });

I did the equivalent ones in the second part of the script.
Hope it helps.