jQuery form unchecked checkbox serialize script

jquery-custom-serialize.js

 //source https://tdanemar.wordpress.com/2010/08/24/jquery-serialize-method-and-checkboxes/
 //added selector option
 (function ($) {

    $.fn.serialize = function (options) {
      return $.param(this.serializeArray(options));
    };

    $.fn.serializeArray = function (options) {
      var o = $.extend({
        checkboxesAsBools: false,
        defaultselector: 'custom-sw'
      }, options || {});

      var rselectTextarea = /select|textarea/i;
      var rinput = /text|hidden|password|search/i;

      return this.map(function () {
          return this.elements ? $.makeArray(this.elements) : this;
        })
        .filter(function () {
          return this.name && !this.disabled &&
            (this.checked ||
              (o.checkboxesAsBools && this.type === 'checkbox' && $(this).hasClass(o.defaultselector)===true) ||
              rselectTextarea.test(this.nodeName) ||
              rinput.test(this.type));
              
        })
        .map(function (i, elem) {
          var val = $(this).val();
          return val == null ?
            null :
            $.isArray(val) ?
            $.map(val, function (val, i) {
              return {
                name: elem.name,
                value: val
              };
            }) : {
              name: elem.name,
              value: (o.checkboxesAsBools && this.type === 'checkbox' && $(this).hasClass(o.defaultselector)===true) ? //moar ternaries!
                (this.checked ? 'true' : 'false') : val
            };
        }).get();
    };

  })(jQuery);

$("#myform").serialize({ checkboxesAsBools: true, defaultselector: 'custom-checkbox'});