Not safe enough:

sub ref_push
{
    if (ref $_[0] eq "ARRAY") {
        push @{$_[0]}, @_[1..$#_];
        }
    elsif (ref $_[0]) {
        warn "Cannot push onto non-ARRAY ref";
        }
    elsif (!defined $_[0]) {
        $_[0] = [ @_[1..$#_] ];
    else {
        warn "Cannot push: Variable already defined as something else"
+;
        }
    } # ref_push
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