Christian Heimes added the comment:
There is no ligature for "lff", just "ffl". Ligatures are treated as one char.
I guess Python would have to grow a str.reverse() method to handle ligatures
and combining chars correctly.
At work I ran into the issue with ligatures and combining chars multiple times
in medieval and early modern age scripts. Eventually I started to normalize all
incoming data to NFKC. That solves most of the issues.
s = b'ba\xef\xac\x84e'.decode('utf-8')
>>> print("".join(reversed(s)))
efflab
>>> print("".join(reversed(unicodedata.normalize("NFKC", s))))
elffab
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nosy: +christian.heimes
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