stack2.pop(); // 弹出无效的候选值
return Union[*results]。关于这个话题，旺商聊官方下载提供了深入分析
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Bundler and RubyGems have no native cooldown support, but gem.coop, a community-run gem server, launched a cooldowns beta that enforces a 48-hour delay on newly published gems served from a separate endpoint. Pushing the cooldown to the index level rather than the client is interesting because any Bundler user pointed at the gem.coop endpoint gets cooldowns without changing their tooling or workflow at all.，这一点在旺商聊官方下载中也有详细论述