ASSERT in QChar, caused by QUrl::toString()

Using the following example

#include <QUrl>
int main(int argc, char** argv)
{

    QString badUrl("http://localhost.de");
    badUrl.append(QChar(0x8be3a1));

    QUrl crashUrl(badUrl);
    QString ret = crashUrl.toString(); //crash here

    return 0;
}

causes an ASSERT

ASSERT: "starter >= from" in file tools/qchar.cpp, line 1574

Program received signal SIGABRT, Aborted.
0x00007ffff6d43995 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: Datei oder Verzeichnis nicht gefunden.
(gdb) bt
#0 0x00007ffff6d43995 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff6d44e07 in __GI_abort () at abort.c:90
#2 0x00007ffff7955344 in qt_message_output (msgType=<optimized out>, msgType@entry=QtFatalMsg, buf=<optimized out>)
at global/qglobal.cpp:2323
#3 0x00007ffff79554a0 in qt_message(QtMsgType, const char *, typedef __va_list_tag __va_list_tag *) (msgType=msgType@entry=QtFatalMsg,
msg=msg@entry=0x7ffff7ad11d8 "ASSERT: \"%s\" in file %s, line %d", ap=ap@entry=0x7fffffffd348) at global/qglobal.cpp:2369
#4 0x00007ffff7955614 in qFatal (msg=msg@entry=0x7ffff7ad11d8 "ASSERT: \"%s\" in file %s, line %d") at global/qglobal.cpp:2552
#5 0x00007ffff7955656 in qt_assert (assertion=assertion@entry=0x7ffff7b153e0 "starter >= from",
file=file@entry=0x7ffff7b153d0 "tools/qchar.cpp", line=line@entry=1574) at global/qglobal.cpp:2018
#6 0x00007ffff79b4de9 in composeHelper (from=1, version=QChar::Unicode_3_2, str=0x7fffffffd5b0) at tools/qchar.cpp:1574
#7 qt_string_normalize (data=data@entry=0x7fffffffd5b0, mode=mode@entry=QString::NormalizationForm_KC,
version=version@entry=QChar::Unicode_3_2, from=from@entry=1) at tools/qstring.cpp:6376
#8 0x00007ffff7a139ce in qt_nameprep (source=source@entry=0x7fffffffd5b0, from=from@entry=0) at io/qurl.cpp:3029
#9 0x00007ffff7a1a518 in qt_is_idn_enabled (domain=...) at io/qurl.cpp:3277
#10 qt_ACE_do (domain=..., op=<optimized out>, op@entry=NormalizeAce) at io/qurl.cpp:3329
#11 0x00007ffff7a1a87a in QUrlPrivate::canonicalHost (this=this@entry=0x6040a0) at io/qurl.cpp:3494
#12 0x00007ffff7a1ddd6 in QUrlPrivate::authority (this=0x6040a0, options=...) at io/qurl.cpp:3565
#13 0x00007ffff7a20089 in QUrl::toString (this=0x7fffffffd810, options=...) at io/qurl.cpp:5821
#14 0x0000000000401adf in main (argc=1, argv=0x7fffffffd948) at /home/buscher/QT/qcrash-qchar/main.cpp:11

and makes all applications using QUrl crashable(assertable)