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if classof( object) 
   do_this();
...
end;

if classof( object).has_method( X ) ....

if( classIsClosed ) {
    lookup the address of the code in this class, fix up the parameter
+s and invoke it.
...
    Fix up the parameters, (with possible further class and method res
+olution cycles.
    Invoke the code.
}

    :canonical      # canonical dispatch order
    :ascendant      # most-derived first, like destruction order
...
    :method(Str)        # only classes containing method declaration
    :omit(Selector)     # only classes that don't match selector
    :include(Selector)  # only classes that match selector