sharedtest/ldtestdata package provides an alternative to ldfiledata for simulating feature flag data in test code.EvaluationDetail type from go-sdk-common now uses a new type, ldvalue.OptionalInt, for the VariationIndex field. Previously, this field was an int and used the special value -1 to represent "undefined". OptionalInt has a clearer way of indicating when the value is undefined.Fetched April 11, 2026