<PackageReference Include="System.Text.Json" Version="8.0.0-preview.1.23110.8" />

PolymorphicSerializationState

namespace System.Text.Json { internal enum PolymorphicSerializationState : byte { None, PolymorphicReEntryStarted, PolymorphicReEntrySuspended, PolymorphicReEntryNotFound } }