comment on RFE: 'shift'' [N] ARRAYNAME

[L A Walsh]

It struck me as it might be convenient if 'shift' could take an optional
arrayname as an argument.  Would that be possible or would it cause some
incompatibility?

i.e.

>  set one two three four five
>  dcl -a ARGV=("$@")
>  shift ARGV
>  echo "${ARGV[@]}"
two three four five
>  shift 2 ARGV
four five

I know it can be done with a function, but with more mess.
I used (maybe there's a better way, but...):

(in my lib file ArFuncs.shh, that I can include)

[include stdalias]
#[include Types] #if type-checking include Types+line below
lshift () {
 (($#)) || return 1
 int nshift=1
 if [[ $1 =~ ^[0-9]+$ ]]; then nshift=$1; shift;fi
 #if ! isArr $1; then echo >&2 "Need arrayname"; return 1; fi
 my ar=$1; shift
 my h="$ar[@]"
 set "${!h}"
 shift $nshift
 eval "${ar}=("$@")"
}; export -f lshift