C Locale not the same as en_US

The documentation says "The "C" locale is identical in behavior to English/UnitedStates."

This is trivially shown to not be the case:

QLocale usLocale = QLocale(QLocale::English, QLocale::UnitedStates);
QLocale cLocale = QLocale::c();

QDate date(2010, 5, 9);

qDebug() << usLocale.toString(date) << cLocale.toString(date);
qDebug() << usLocale.toString(date, QLocale::ShortFormat) << cLocale.toString(date, QLocale::ShortFormat);

...

QDEBUG : TestInternationalization::testDates(date-01) "Sunday, May 9, 2010" "Sunday, 9 May 2010"
QDEBUG : TestInternationalization::testDates(date-01) "5/9/10" "9 May 2010"