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— Auto-shutdown of unused servers
，更多细节参见新收录的资料
10 PRINT "Hello, world!"
In general, though, we can’t solve this problem with pull-only reactivity. The input node that gets updated just doesn’t have the information to tell us what its dependants are, and therefore what output nodes are eventually going to need to change. But we could try a different approach, where we do try and store that information. A combination of pushing and pulling — some kind of suicide squad push-pull reactivity?