I propose to accept a callback function in the serializeArray, so that the users can customize or filter the returning object.

For example:

$('#form').serializeArray(function(elem,val){
  return {label:elem.name, value:val, type:elem.type};
});

This produces the following data structure:

[{label: "a", value: "1", type: "text"},
 {label: "b", value: "2", type: "text"},
 {label: "c", value: "3", type: "hidden"},
 ....]

Or more powerful one:

$('#form').serializeArray(function(elem,val){
  var $elem = jQuery(elem);
  if($elem.hasClass('invalid')){
    return null;
  }
  else if($elem.is(':date')){
    return {name:elem.name, value: mySpecialDateFormat(val)};
  }
  else if($elem.is(':hidden')){
    mySpecialMethodToHandleHiddenInput(elem.name, val);
  }
  return {name:elem.name, value:val};
});