Perhaps too unlikely to be encountered to be worth looking into but
here's a collection of issues encountered with IFS set to \001 or
\177:
n() { (($#)) && printf '<%q>' "$@"; echo; }
# expected observed changed in
IFS=$'\001'
set -- x
n "${@}" # <x> <''><''><x> bash-4.0
n ${0+"$*"} # <x> <''><x> bash-3.3
n "$@""" # <x> <''><''><x> bash-3.3
n "${0+$@}" # <x> <''><''><x> bash-3.3
n ${0+"$@"} # <x> <$'\177'><x> bash-3.3
set -- x x
n "${@}" # <x><x> <''><''><$'x\177'><''><x>
set -- '' ''
n $*"" # <''><''> <$'\177'> bash-4.2
n ${0+$*""} # ?? <$'\177'> bash-20190220
IFS=$'\177'
set --
n ""$*"" # <''> <''><''> bash-4.2
n ${0+""$*""} # <''> <''><''> bash-20190220
set -- x
n ${0+"""$*"} # <x> <''><x> bash-20190220
set -- "$IFS"
n """$@" # <$'\177'> <''><$'\177'> bash-4.2
n ${0+"""$@"} # <$'\177'> <''><''><$'\177'> bash-20190220
set -- "x$IFS"
n ""$* # <x> <''><x> bash-4.2
n ${0+""$*} # <x> <''><x> bash-20190220
set -- '' ''
n "${@}" # <''><''> <''><''><''><''><''>
n "$@""" # <''><''> <''><''><''><''><''><''>
n ${0+"$@"} # <''><''> <''><''><''><''><''><''><''><''><''>
n "${0+$@}" # <''><''> <''><''><''><''><''><''><''><''><''>
