random832 added the comment:
I can't reproduce without pickle. I did some further digging, though, and it
*looks like*...
1. Pickle causes the built-in UTF-8 representation of a string to be populated,
whereas encode('utf-8') does not. Can anyone think of any other operations that
do this?
2. After the UTF-8 representation of the 2-character string is populated,
concatenating a new character to it does not update or clear it.
3. However, it worked just fine with the 1-character string - concatenating it
caused the UTF-8 representation to be cleared.
The actual operation that creates an inconsistent string is the concatenate
operation, but it only happens with a string that has been "primed" by having
its UTF-8 representation materialized.
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<http://bugs.python.org/issue25709>
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