TODO

TODO items -- and various notes as well

o The whole setting-up-accessors bit is kludgy and messy.  Too much
  quoted and eval'd and sprintf'd stuff..  it needs some desperate
  reworking towards elegance.
o Setting default values and adding finalisers is all well and good
  when the variables are only used by a single entity -- but not so
  hot when they're actually shared.  You don't want to
  initialise-to-default an existing variable someone else was using
  before you joined, and you don't want to delete a shared element
  from the cache just because *you're* exiting.  Adding controls for
  these needs to be a fairly high priority for this package to be
  truly useful..
o Should private variables be allowed to have user-set names?
  [For now, no.]
o Need to test true sharing, in which cell names are *not* necessarily
  unique to each test, and may be left around between them
o Annotating the return value with singleton methods that update the
  cache works, but unexpectedly has some issues:

  f = Foo.new
  f.shared_cell = {}
  p1 = f.shared_cell
  f.shared_cell['k1'] = 'v1'
  p1
  => {'k1'=>'v1'}			# As expected and designed
  p1['k2'] = 'v2'
  f.shared_cell
  => {'k1'=>'v1','k2'=>'v2'}		# As expected and designed
  f.shared_cell = 5
  p1
  => {'k1'=>'v1','k2'=>'v2'}		# NOT as expected
  p1['k3']='v3'
  f.shared_cell
  => {'k1'=>'v1','k2'=>'v2','k3'=>'v3'}	# NOT as expected

  How to deal with this?  Add some sort of counter such that direct
  frobs of the ivar invalidate (delete singleton methods) any
  outstanding references?

o Pass more information to the accessor naming block.