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> 2. Use eval from C to create the class with a metaclass, eg.
> class Foo(metaclass=MessageMeta)
You can also call (PyObject_Call*) the metaclass with (name, bases, namespace); this should produce a class. Or not:
 >>> class Foo(metaclass=print):
 ... def foo(self): pass
 ... 
 Foo () {'__module__': '__main__', '__qualname__': 'Foo', 'foo': <function Foo.foo at 0x7f6e9ddd9e50>}
PyType_FromSpecEx will surely need to limit the metaclass to subtypes of type. What other limitations are there? How closely can we approach the behavior of the `class` statement in Python?
> 3. Manually set FooType->ob_type = &MetaType
I wouldn't recommend doing that after PyType_Ready is called. Including indirectly, which the type-creation functions in the stable ABI do.