Everyone's had to deal with some sort of data
inheritence at one time or another. This was
the answer I came up with after re-writing
the process for myself a number of times.

It uses NEXT to pass a empty, blessed referent
through all of its base classes' init calls.
Depending on the type of object (hash, queue,
or stack) the process is done top-down or
bottom up. 

NEXT::init::install installs "construct" and 
"init" subs in the callers space if they don't
already exist, and installs %meta or @meta
(depending on the base type). After that calls
like $class->construct( @argz ) will produce
a new object with the arguments overriding
(or at the start/end) of the result.