massive memory leak

Hi,

I'm still using r1023755 from trunk, but I haven't seen a commit which I
think would fix this:

There's a massive memory leak somewhere. I can't check out even small
projects anymore since the memory consumption raises very fast and
reaches the limit of my available RAM (6GB) after about the first 100
files. After that, the system isn't usable anymore because the constant
swapping.

I then tried an update of the interrupted checkout (had to hard reset
the system because it wasn't reacting anymore), but the update too uses
up all memory in a few seconds.

Switching to neon instead of the default serf fixes the problem. So this
is limited to either serf itself or ra_serf.
I'm using serf 0.7.0

Stefan

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