$ echo ${.sh.version}
Version JMP 93u+ 2012-02-14
$ arr=( )
$ echo "$arr"
(
) <---- ???
$ typeset -a arr=( ) <-- But this works fine.
$ echo "$arr"
$
Another case:
$ typeset -a arr=( ( 11 22 33 ) ( 44 55 ) )
$ arr[1]+=( 66 )
$ echo ${arr[1][@]}
44 55 66
$ arr[1]=( ) <-- Here I want to set arr[1] to an empty array
ksh-20120214: 1: invalid variable name
$
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