infscr_loadcallback behavior call function missing url parameter

When using a custom infscr_loadcallback behavior, the url isn't available in the parameters.

Apart from this, I would like to continue after the custom callback function. So is this possible?

    if (!!opts.behavior && this['_loadcallback_'+opts.behavior] !== undefined) {
        return this['_loadcallback_'+opts.behavior].call(this,box,data,url);
    }