Re: unset IFS and ${v=$*} CTLNUL leakage

[Grisha Levit]

A few more that produce \177 in the output, though I'm not sure if
these have defined output:

    $ IFS=$' \t\n'   # or any other IFS
    $ set -- ''
    $ recho ${v= "$*" }
    <$'\177'>

    $ IFS=''
    $ set -- '' ''
    $ recho ${v= "$*" }
    <$' \177 '>

And also variations like the below all have \177 as well, but these
I'm pretty sure are undefined:

set -- ''
recho ${v= $@ }
recho ${v= $@"" }

set -- '' ''
recho ${v= $@ }
recho ${v= "$@" }
recho "${v= $@}"
recho ${v= "$@"}