[racket] Unicode Question

Hi,

In the attached file, use of string-normalize-nfc truncates the
string.  Is this expected?  I tried on Mac and Windows, using 5.2.1,
5.3.1, and the latest nightly.  According to
http://unicode.org/reports/tr15/ form C might alter the bytes, but
shouldn't change the displayed form, let alone truncate.

Here's a gist if that's preferable: https://gist.github.com/7de39c77f98fc45cd03d

Also, I have no idea what the text says.  If it's
inappropriate/offensive, I apologize.

Thanks,
Nick
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