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+zsh (5.4.1-2) unstable; urgency=medium
+
+  From the upstream README of 5.4.1:
+
+  > The default behaviour of code like the following has changed:
+  >
+  >   alias foo='noglob foo'
+  >   foo() { print function body; }
+  >
+  > When this is encountered in a start-up file, or other place where
+  > input was read line by line, "foo" is in command position and is
+  > expanded as an alias before the function definition takes place.  In
+  > previous versions of the shell, this caused two functions "noglob" and
+  > "foo" to be defined.  Any expansion of an alias in a function
+  > definition is nearly always an unintended effect, as well as hard to
+  > detect, so has been made an error.  (The option setting
+  > NO_MULTI_FUNC_DEF turned this case into an error, but did not help
+  > with other cases and is off by default.)  The alternative, of not
+  > expanding the alias, was rejected as it was more difficult to achieve
+  > in the parser and also would silently change the shell's behaviur
+  > between versions.  A new option, ALIAS_FUNC_DEF, has been added, which
+  > can be set to make the shell behave as in previous versions.  It is in
+  > any case recommended to use the "function" keyword, as aliases are not
+  > expanded afterwards.
+
+  The common error message triggered by this change looks as follows:
+
+  > zsh: defining function based on alias `foo'
+  > zsh: parse error near `()'
+
+  See https://bugs.debian.org/871816 for more information.
+
+ -- Axel Beckert <abe@debian.org>  Fri, 11 Aug 2017 21:43:25 +0200
+
+zsh (5.0.0-1) unstable; urgency=low
+
+  This update includes a rewrite of keyboard handling in `/etc/zsh/zshrc'.
+
+  The used method should be quite a bit more robust than the old one, and
+  should work out of the box for every terminal with a working terminfo entry.
+
+  If you do not want Debian's zshrc to mess with your keyboard setup, set the
+  following variable in your `.zshenv' file:
+
+    DEBIAN_PREVENT_KEYBOARD_CHANGES=yes
+
+  This change also removes the controversial vi-* bindings for the up and down
+  cursor keys (which was reported as #383737 and led to confusion with a
+  substantial number of users). If you want them back use the following snippet
+  in your `.zshrc' file (and without the above variable set):
+
+    for i in viins vicmd; do
+      bindkey -M "$i" "${key[Up]}" vi-up-line-or-history
+      bindkey -M "$i" "${key[Down]}" vi-down-line-or-history
+    done
+    unset i
+
+ -- Frank Terbeck <ft@bewatermyfriend.org>  Sat, 03 Mar 2012 21:28:54 +0100