[perl #60404] Array becomes string in subroutine or method calls

[Patrick R. Michaud via RT]

Unfortunately I think this patch causes the following to fail:

    sub foo($a) { 1.say for $a }

    foo((1,2,3));

The problem is that simply looking at (misnamed) Perl6Scalar and
deciding what to do is a little coarse-grained.  The real problem is in
the argument binding to a scalar versus array variable.

We'll probably revisit this as part of updating parameter passing
semantics.  In the meantime, reopening the ticket until the above case
is resolved also.

Pm