Tie::VecArray

I just threw together Tie::VecArray 0.01 and put it on CPAN.  Its been
sitting at the top of the Todo list for so long I figured somebody
should just do it.

Its a fairly simple implementation leaving most of the hard stuff to
Tie::Array.  I'll optimize POP, PUSH, and SPLICE later.  I could
tighten down the use of memory a smidge by using a scalar for the
object instead of a pseudohash (placing object information in the
first 128 bits) but I don't think that's really necessary.

Tie::VecArray can't do multidimensional tied vectors, but I can pull
it off.  I'll add a Tie::VecArray::MultiD subclass in a few days.  You
guys decide if its worth putting into the core.

Oh, its really slow.  *Really* slow.  About 8 times slower than vec()
access.  (Using the object directly is about 3 times slower).  This
coincides with the expected sluggishness of the tie interface.

Tie::SubstrArray isn't far off, they should be very similar.

• Tie::VecArray by Michael G Schwern