TODO:

* It seems the local case optimization can go wrong when
  invoking bogus methods from a different interface on an Object ref.
+ this is to do with
a) not checking the vepv offset we get
b) not expanding the lookup of the vepv offset at all.

* Thread safety
+ apparently g_object_ref / unref are not thread safe
  we need linc_object_ref / unref instead that does
  a LINC_MUTEX_LOCK on the global object lifecycle lock
  that needs to move into linc ... sigh !

+ we need to ensure that linc does no signal emissions,
  since these are horribly slow and again not safe.

* Optimization
+ we need some concept of align == native align flagged
  on TypeCodes, so we can blat things quickly with memcpy
  in a generic way - eg. sequences of octets.

* Dragons:
+ giop_recv_buffer.c (giop_connection_handle_input)
  manages to go through the error condition a whole
  load; _why_ is this ? - is it a recursive effect on
  the method ? why are we called if there is no data ?