Forçar serialize() do jQuery reconhecer checkboxes mesmo não marcado

jquery.serialize_replace.js

$(function() {

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

     $.fn.serializeArray = function (options) {
         var o = $.extend({
         checkboxesAsBools: false
     }, 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')
             || 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') ? //moar ternaries!
                        (this.checked ? 'T' : 'F') :
                        val
             };
         }).get();
     };

});

// créditos: http://tdanemar.wordpress.com/2010/08/24/jquery-serialize-method-and-checkboxes/