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set -- ' abc' 'def ghi' 'jkl '
echo normal IFS
recho $@
: ${var=$@}
recho $var
unset -v var
recho ${var-$@}
echo null IFS
IFS=
recho $@
: ${var=$@}
recho $var
unset -v var
recho ${var-$@}
echo non-standard IFS
IFS=:
recho $@
: ${var=$@}
recho $var
unset -v var
recho ${var-$@} # this is inconsistent
echo unset IFS
recho $@
: ${var=$@}
recho $var
unset -v var
recho ${var-$@}
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