Documentation should state that React preserves setState callback this context

I just recently found out that setState's callback calls with the correct this context per this line in the React source. Nowhere in the documentation is it stated that React internally calls callbacks with context. This should be made clear as many assume it doesn't, leading to unnecessary measures such as arrow functions, explicit binding, etc.

The lack of explicit documentation also creates confusion with other things that do require binding, such as traditional class methods used as event handlers.

Comienza con la línea enlazada de ReactFiberUpdateQueue.js y revisa la documentación existente del callback de setState. El trabajo estará terminado cuando la documentación indique explícitamente que el callback recibe el contexto this correcto y distinga esto de los métodos de clase utilizados como controladores de eventos.