- update to 5.9:
  zsh 5.9 is dedicated to the memory of Sven Guckes, who was, amongst other
  things, a long-time zsh advocate.  For more information, see:
    https://linuxnews.de/2022/02/sven-guckes-verstorben/
    https://groups.google.com/g/vim_announce/c/MJBKVd-xrEE/m/joVNaDgAAgAJ
  When unsetting a hash element, the string enclosed in square brackets is
  interpreted literally after any normal command-line-argument expansions.
  Thus
    unset "hash[$key]"
  first expands $key as usual for a double-quoted string, and then interprets
  that result as the exact hash element to unset.  This differs from previous
  versions of the shell, which would also remove a leading backslash for an
  unusual subset of characters in the expansion of $key.  Note this also
  means, for example, that now
    unset 'hash[ab]cd]'
  unsets the element with key "ab]cd" rather than silently doing nothing.
  The function command learnt a -T option to declare a function and enable
  tracing for it simultaneously.
  The option SHORT_REPEAT was added to enable the short syntax of
  SHORT_LOOPS for the repeat command only. It is disabled by default.
  The _arguments function now supports NUL-delimiting optargs in the
  opt_args array via the -0 option. Developers of completion functions
  should find this easier to handle reliably than the default
  colon-delimiting behaviour.
  The zsh/system module's `zsystem flock` command learnt an -i option to
  set the wait interval used with -t. Additionally, -t now supports
  fractional seconds.
  The option CLOBBER_EMPTY was added to enable the overwrite behaviour
  of CLOBBER for empty files only. It is disabled by default.
  A (-) expansion flag was added. It works like (n) but correctly sorts

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