Stringstream error

[William Candillon]

The following query:

import module namespace http = "http://www.zorba-xquery.com/modules/http-client";

declare namespace h = "http://expath.org/ns/http-client";

let $item := http:send-request(<h:request href="https://stream.twitter.com/1/statuses/sample.json?delimited=length"
                                                                             method="GET"
                                                                             username="foo"
                                                                             password="bar"
                                                          />,
                                                        "https://stream.twitter.com/1/statuses/sample.json?delimited=length",
                                                        ()
                                )[2]
return $item

Fails when text serialization is used:
zorba -q test.xq -f --serialize-text
Zorba error [zerr:ZXQP0003]: internal error: basic_ios::clear