这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。
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，更多细节参见Line官方版本下载
Under the hood, BPattern builds a pattern AST using the same pattern node classes as the rewrite engine. All the original matching and rewriting machinery is still there — just wrapped in a more approachable, scriptable interface.
const curTime = posToTime.get(pos);