This exercise found an inconsistency involving char16_t. Filed
QTBUG-125588 to keep track of this and decide how to deal with it.
Task-number: QTBUG-125588
Pick-to: 6.7 6.5
Change-Id: I259fecef34539e8841149570d7411d959b48d876
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>