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var=$'\01\02\03\177'

bar=${unset:-$var}
recho "$bar"
unset -v bar
bar=${unset:-"$var"}
recho "$bar"

foo=${parameter:=$var}

recho "$foo"
recho "$parameter"

unset -v foo parameter

foo=${parameter:="$var"}

recho "$foo"
recho "$parameter"

unset -v foo parameter

foo="${parameter:=$var}"

recho "$foo"
recho "$parameter"

unset -v foo parameter

recho ${parameter:=a\ b}
unset -v parameter

recho ${parameter:="a b"}
unset -v parameter

v='a b'

recho ${parameter:=$v}
unset -v parameter

recho ${parameter:="$v"}
unset -v parameter

# unsetting IFS here

set "  abc  " " def  ghi " "jkl "
unset -v IFS var
var=${var-$*}/${var-$*}
printf '[%s]\n' "$var"

unset -v var
: ${var=$*}
printf '[%s]\n' "$var"

unset -v var
: ${var:=$*/$*/${var-$*}}
printf '[%s]\n' "$var"