Wow, typo(s) of the week! Or do I mean the decade?
This bug has been latent for 6.75 years, and lay dormant all that time because the Arbitrary instance for Char only generates ASCII. I just switched the Arbitrary instance for Text to generate a wider range of Unicode code points, thanks to the quickcheck-unicode package. (I'm afraid I don't recall why I didn't do this much earlier...)
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