Memory "leak" for bzr+ssh

[John Arbash Meinel]

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I just realized what might have been the apparent memory leak.
Specifically, it might be the "cached_utf8" functions. I'm not 100%
positive, but we are caching them as Unicode and as utf-8 strings, which
seems like a pretty good way to waste quite a bit of memory.

Just something we should probably look at.

We might consider turning that cache into an LRU cache, so that it stays
a bit more bounded in memory consumption.

John
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