$ /bin/bash -uc ' echo ${1+"$@"}; echo hi; echo "$@" '
hi
$ /bin/ksh -uc ' echo ${1+"$@"}; echo hi; echo "$@" '
hi
/bin/ksh: line 1: @: parameter not set
This looks like bash got this one right. This should not be a failure,
or else it's back to using ${1+"$@"} everywhere (UGH!) or not using
nounset.
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