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If two timers run on the same tick, and the first timer uses a domain, and then catches an exception and disposes of the domain, then the second timer never runs. (And even if the first timer does not dispose of the domain, the second timer could run under the wrong domain.) This happens because timer.js uses "process.nextTick()" to schedule continued processing of the timers for that tick. However, there was an exception inside a domain, then "process.nextTick()" runs under the domain of the first timer function, and will do nothing if the domain has been disposed. To avoid this, we temporarily save the value of "process.domain" before calling nextTick so that it does not run inside any domain.