See following example:
$ echo ${.sh.version}
Version AJMP 93u+ 2012-08-01
$ arr=(11 22)
$ typeset -p arr
typeset -a arr=(11 22)
$ unset arr[0]
$ unset arr[1]
$ typeset -p arr
typeset -a arr=([0]=)
$The 2nd `typeset -p' command should output nothing.
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