double-truncate to avoid inefficient encodeString() usage #413
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Closes #366.
There are some existing tests that were broken in as I was working on this, so I think those plus the new test are enough.
Re: the example raised in the issue, I see timing drop from ~1s to ~0.25s on my machine. Still noticeably slow, but a definite improvement. A quick profile shows we're going to need to drop to C++ to do any better.