* Things to think about

  + Reorganize output protocol so that metaclasses can override the
    layout.  Split ~hook-output~ into a pair of generic functions: one
    for walking the tree, which should continue to be
    ~progn~-combination, and one for producing output, which subclasses
    can override.

  + Implement `indirect' slots and messages, which can be added (once a
    class has declared support) /without/ breaking the class's ABI.
    Indirect messages can be added to an indirect `vtmsgs' structure via
    a pointer in the main vtable.  Indirect slots must be added to a
    region of the `ilayout' located via an offset stored in the vtable.

  * Add `documentation' methods for all of the myriad kinds of things
    that can be defined.  A useful utility will find methods on a
    generic function with an `eql'-specializer in some specified place.

  * Define static initializers for class layouts which obviate the need
    for imprinting.

* COMMENT Emacs cruft

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