Don't check for being in the middle of a codepoint when at end-of-stream (fixes #130) #131
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If we #position: a character readStream and the argument corresponds to end-of-stream, we don't want to try to read off the end of the stream--but we can be sure that we're not in the middle of a (valid) codepoint, regardless.
I suppose we could be in the middle of an invalid codepoint, if the stream cuts off in the middle of one. For my use-case I'm not concerned about that, as I would never have gotten that far in the first place without an error. I also think if you had an incomplete codepoint in the middle of a stream, positioning the stream immediately after it wouldn't skip backwards or complain—so essentially I'm treating end-of-stream as an initial byte, and otherwise the behavior is the same as elsewhere.