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From: isabella parakiss <izaberina@gmail.com>
Newsgroups: gnu.bash.bug
Subject: \177 at the end of a variable
Date: Mon, 23 Nov 2015 11:29:51 +0100
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$ str=abcd; [[ $'a\177' = a"${str:4:1}" ]]; echo $?
0


This happens in every version since 3.1, including the devel branch.

---
xoxo iza