cua mode and cperl-mode don't play ball

[Kai Großjohann]

emacs -q -no-site-file
Eval (setq cperl-hairy t)
C-x b foo RET
M-x cperl-mode RET
Type something.
Use shifted cursor keys to mark something.
Hit <backspace>.

It ought to delete the region IMVHO, but doesn't.

-- 
A preposition is not a good thing to end a sentence with.