QLocale::toStrings uses E instead of e

Reproducible both in C++ and (with PySide6) in Python. Here is the Python example:

In [1]: from PySide6.QtCore import QLocale

In [2]: QLocale(QLocale.English).toString(1e6, 'e')
Out[2]: '1.000000E+06'

In [3]: QLocale(QLocale.English).toString(1e6, 'g')
Out[3]: '1E+06'

Note the uppercase E. The documentation, if I understand it correctly, says that it should be lowercase, like it is in Qt5:

In [4]: from PySide2.QtCore import QLocale

In [5]: QLocale(QLocale.English).toString(1e6, 'e')
Out[5]: '1.000000e+06'

In [6]: QLocale(QLocale.English).toString(1e6, 'g')
Out[6]: '1e+06'