decimal of 0.1 step

ok it’s my function for my minus button… :/

jQuery(document).ready(function($){   
          
            $('form.cart').on( 'click', 'button.plus, button.minus', function() {
 
            // Get current quantity values
            var qty = $( this ).closest( 'form.cart' ).find( '.qty' );
            var val   = parseFloat(qty.val());
            var max = parseFloat(qty.attr( 'max' ));
            var min = parseFloat(qty.attr( 'min' ));
            var step = parseFloat(qty.attr( 'step' ));
 
            // Change the value if plus or minus
            if ( $( this ).is( '.plus' ) ) {
               if ( max && ( max <= val ) ) {
                  qty.val( max );
               } 
            else {
               qty.val( val + step );
                 }
            } 
            else {
               if ( min && ( min >= val ) ) {
                  qty.val( min );
               } 
               else if ( val > 1 ) {
                  qty.val( val - step );
               }
            }
             
         });
          
      });

But you could just set “Min cart Quantity” = 1.0 & “Step change Quantity” = 0.1