Shadow player as a spectator

[wendavid552]

As we know that players would exit from the game after /shadow.

Now it may be interesting if a shadow player become a e.g. spectator instead. This spectator will not be able to spawn new chunks (just as the spectatorsGenerateChunks), so it does not change the game; and you could still stay in the game and chat with others, without the rendering and networking pressures, etc.