"$THIS_SH" -c 'echo $#'
"$THIS_SH" -c 'echo $#' arg0
"$THIS_SH" -c 'echo $#' arg0 arg1

echo Make sure len parsing doesnt break arg count
set --
echo $# ${#}
set -- aaaa bbb cc d
echo $# ${#}

echo Testing len op
echo ${#1} ${#2} ${#3} ${#4} ${#5} ${#6}

unset e
f=abc
g=
echo ${#e} ${#f} ${#g}

set -- a
# This must be interpreted as: $# ("1"), then remove trailing "1".
# IOW: empty result.
echo Nothing:${##1}
echo Nothing:${#%1}
echo One:${##x}