set -- ''

recho 1 ''"$@"
recho 2 """$@"

recho 3 "$@""$@"
recho 4 "$x""$@"

set --

echo -----
recho 1 ''"$@"
recho 2 """$@"

recho 3 "$@""$@"
recho 4 "$x""$@"

set -- X

echo ------
recho 1 ''"${@/*}"
recho 2 """${@/*}"

recho 3 "$x""${@/*}"

recho 4 ''"${@#X}"
recho 5 """${@#X}"

recho 6 "$x""${@#X}"

set --

echo -----
recho 1 ''"${@/*}"
recho 2 """${@/*}"

recho 3 "$x""${@/*}"

recho 4 ''"${@#X}"
recho 5 """${@#X}"

recho 6 "$x""${@#X}"

echo -----
recho 1 "$novar${*}$(echo)"
recho 2 ''"$novar${@}$(echo)"