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Author serhiy.storchaka
Recipients eryksun, kbk, random832, roger.serwy, serhiy.storchaka, steven.daprano, terry.reedy, Árpád Kósa
Date 2015-11-23.19:20:56
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Marked as misclassified Yes
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Yes, I have came to the same as random832. String objects have "fast path" for concatenating, and in this path cached UTF8 representation is not cleaned. Pickle is one of simplest ways to reproduce this issue. May be it can be reproduced with compile() or type(), but these ways looks too heavyweighted to me.

Here is a patch that fixes strings concatenation.
Date User Action Args
2015-11-23 19:20:56serhiy.storchakasetrecipients: + serhiy.storchaka, terry.reedy, kbk, roger.serwy, steven.daprano, eryksun, random832, Árpád Kósa
2015-11-23 19:20:56serhiy.storchakasetmessageid: <>
2015-11-23 19:20:56serhiy.storchakalinkissue25709 messages
2015-11-23 19:20:56serhiy.storchakacreate