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So here we have a problem. Some plugins are expecting to override
some other plugins. The order can't really be arbitrary.....
Actually, users won't care about order either. We just want to
enable/disable plugins, not really composability.
So it really should be a bucket of plugins. At least for built-in plugins,
so that we would be aware of the order. Users shouldn't pay attention
on the order of built-in plugins.