Py 3.3, unicode / upper()

[wxjmfauth at gmail.com]

I was using the German word "Straße" (Strasse) — German
translation from "street" — to illustrate the catastrophic and 
completely wrong-by-design Unicode handling in Py3.3, this
time from a memory point of view (not speed):

>>> sys.getsizeof('Straße')
43
>>> sys.getsizeof('STRAẞE')
50

instead of a sane (Py3.2)

>>> sys.getsizeof('Straße')
42
>>> sys.getsizeof('STRAẞE')
42


But, this is not the problem.
I was suprised to discover this:

>>> 'Straße'.upper()
'STRASSE'

I really, really do not know what I should think about that.
(It is a complex subject.) And the real question is why?

jmf