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Since all API functions now run immediately after a msgpack-rpc request is parsed by libuv callbacks, a mechanism was added to override this behavior and allow certain functions to run in Nvim main loop. The mechanism is simple: Any API function tagged with the FUNC_ATTR_DEFERRED (a "dummy" attribute only used by msgpack-gen.lua) will be called when Nvim main loop receives a K_EVENT key. To implement this mechanism it was necessary some restructuration on the msgpack-rpc modules, especially in the msgpack-gen.lua script.