docs

http://api.jquery.com/jQuery.param/

As of jQuery 1.8, the $.param() method no longer uses jQuery.ajaxSettings.traditional as its default setting and will default to false. For best compatibility across versions, call $.param() with an explicit value for the second argument and do not use defaults.

actual

https://github.com/jquery/jquery/blob/master/src/serialize.js#L65

    // Set traditional to true for jQuery <= 1.3.2 behavior.
    if ( traditional === undefined ) {
        traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
    }