* 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.

  + Investigate a `robust-ABI' layout using pointers rather than simple
    inclusion.  Each class's islots and vtmsgs will be found by
    following a pointer rather than just magically knowing the offsets.
    If you allocate objects dynamically, using ~CLASS->cls.initsz~
    rather than ~sizeof(CLASS__ilayout)~ then this isolates you from
    added slots and messages at all superclasses.  I expect this to
    require a separate root class, but it /might/ be possible to
    mix-and-match.


* COMMENT Emacs cruft

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