This allows allocating a buffer of double pointers pointing to
the memory location in a bunch of variables. It is not particularly
ergonomic as is, and it seems unlikely the real world performance
benefit will exist.
Going to replace these types since they are so stupid simple and
the originals are not conducive to integrating efficienctly outside
C++. We need a well defined way to get a pointer/reference to the
shared data. The proxy objects frustrate that, but they are
what is baked into the library. The public interface is not altered
except for the ability to access and construct from pointers.
