GenericMixpanelPropertySetterFactory
class GenericMixpanelPropertySetterFactory(mixpanel: MixpanelAPI) : MixpanelPropertySetterFactory, FallbackFactory(source)
Registers any property as a Mixpanel super property, so it rides along on every event sent afterwards. Claims everything, so it belongs last in a chain — and after UserPropertyMixpanelPropertySetterFactory, which would otherwise never see a UserProperty.