ExperimentalFlexibleSyncApi
@Target(allowedTargets = [AnnotationTarget.CLASS, AnnotationTarget.PROPERTY, AnnotationTarget.FUNCTION, AnnotationTarget.TYPEALIAS] )
This annotation mark Realm APIs for Flexible Sync that are considered experimental, i.e. there are no guarantees given that these APIs cannot change without warning between minor and major versions. They will not change between patch versions.
For all other purposes these APIs are considered stable, i.e. they undergo the same testing as other parts of the API and should behave as documented with no bugs. They are primarily marked as experimental because we are unsure if these APIs provide value and solve the use cases that people have. If not, they will be changed or removed altogether.