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![Jonathan Coates](/assets/img/avatar_default.png)
Historically, computers tracked whether any world-visible state (on/off/blinking, label and redstone outputs) had changed with a single "has changed" flag. While this is simple to use, this has the curious side effect of that term.setCursorBlink() or os.setComputerLabel() would cause a block update! This isn't really a problem in practice - it just means slightly more block updates. However, the redstone propagation sometimes causes the computer to invalidate/recheck peripherals, which masks several other (yet unfixed) bugs.