OrderedDictionary
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remove warnings when building with XCode 9
Fix warnings like below:
- 'objectForKeyedSubscript:' is only available on iOS 6.0 or newer
- 'setObject:forKeyedSubscript:' is only available on iOS 6.0 or newer
- 'NSOrderedSet' is partial: introduced in iOS 5.0
- 'decodeObjectOfClass:forKey:' is only available on iOS 6.0 or newer .... and so on.