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function f {
   typeset -a a
   a=("$@")
   typeset IFS=,
   typeset a1="${a[@]} ${a[*]} $@ $* ${@} ${*}"
   typeset a2=${a[@]}\ ${a[*]}\ $@\ $*\ ${@}\ ${*} a3 a4
   a3="${a[@]} ${a[*]} $@ $* ${@} ${*}"
   a4=${a[@]}\ ${a[*]}\ $@\ $*\ ${@}\ ${*}
   unset -v IFS
   printf '%s\n' "a1=$a1" "a2=$a2" "a3=$a3" "a4=$a4"
}

echo
f a b c