修复在迁移过程中设置null值导致的问题 #3
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Avoid setting null object in migration, and use default value when getting null object from storage
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null的类型是object，迁移数据过程中仅使用类型名判断将导致'speedup-thres'和'speeddown-thres'的值设为null，导致脚本无法正常运行