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A fix for #3. I took a shortcut compared to the suggestion in the ticket; namely, I think it's OK to coerce things to a stream and from a stream to the desired thing, so that there isn't this 3x3 matrix of conversions, just to and from streams. That means it does more work than it needs to, but it reduces the amount of code. I also took a non-standard approach to the tests: I reused the coercer to reverse the coercion and make sure we had the right thing. Otherwise, I'd basically just have to repeat the coercion logic in the test.