Also avoid massive long __repr__ strings for complex geometries,
as these can flood the Python console (and first aid plugin),
and aren't useful for debugging anyway.
Refs #14640
All your uses of toUtf8().data() actually just need a const char*
So use constData() that is semantically more correct, and documented
to be faster.
From http://doc.qt.io/qt-5/qbytearray.html#data
"For read-only access, constData() is faster because it never
causes a deep copy to occur."
