public protocol MixpanelType: Any
Property keys must be String objects and the supported value types need to conform to MixpanelType. MixpanelType can be either String, Int, UInt, Double, Float, Bool, [MixpanelType], [String: MixpanelType], Date, URL, or NSNull.
Checks if this object has nested object types that Mixpanel supports.
func isValidNestedType() -> Bool