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public final class ExperimentVariantA single experiment variant.
SPEC-070-A F.10: Firestore-canonical key for variant data is
payload(matching iOSExperimentVariant.payload); legacy SDKs wroteconfig. The parser in RemoteConfigManager.parseExperiments accepts BOTH keys, preferringpayloadwhen set. The Kotlin field stays namedconfigso all existing callers (e.g. ExperimentManager.getValue) keep working.