TL;DR: Encoding is hard.

Fixed a dupe detection bug in my bot by using an edit distance limit instead of relying on string equality.
x.com/ianisqatsibot/…
Twitter's alt text field seems to support certain ws characters that get stripped when posting a tweet containing those chars.
So, being too lazy to figure out how to scrub the source data I added a filter based on an edit distance < 10 to remove likely dupes.
Ian Brown @igb
It has an added benefit in this particular bot's case of eliminating similar descriptions of similarly annotated photos.
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(which is actually common when a tweet contains multiple photos...often times they are of the same subjects from a different angle or moment)