Feliks added the comment:
Well, there is some anecdotal evidence. ;-) I happen to have a lot of
experience with a lot of programming languages, and I was bitten by this.
Let's put it like this: it is quite easy to overlook the significance of the
sentence in question. One looks a
New submission from Feliks:
In Sec. 7.2.1 of the Language Reference, in the description of "+=" we have:
"Also, when possible, the actual operation is performed in-place, meaning that
rather than creating a new object and assigning that to the target, the old
object is m
