• Managed types used extensively. Because of this, the recommended Arwen minimum version is v1.4.10.
  • Redesigned parts of the elrond-codec, so as to allow custom type specializations. These specializations allow serializers and types to bypass the limitations of the codec traits to provide optimized implementations. Managed type serialization relies on this.
  • Redesigned existing managed types: BigInt, BigUint, EllipticCurve.
  • Added the ManagedBuffer type, which can be used to store anything on the VM side.
  • Support for complex operations using managed buffers, such as storing lists of elements in a managed buffer via the ManagedVec type.
  • There are ManagedAddresses now. They rely on another managed type, the ManagedByteArray, which is a fixed size managed structure.
  • TokenIdentifier is now a managed type.
  • Serializer based on a managed buffer.
  • Storage keys are now based on managed buffers.
  • All error messages generated by the framework are assembled using a managed buffer.
  • The blockchain API uses managed types for most interactions.
  • The contract call API uses managed types for most interactions.
  • The call value API supports multi transfer via managed EsdtTokenPayment objects.
  • Event logs are sent to the VM via managed types (ManagedVec<ManagedBuffer> for topics, ManagedBuffer for data).
  • Type conversion traits for managed types: ManagedFrom and ManagedInto.
  • There are now 2 types of SCError: StaticSCError for static messages and ManagedSCError, which is backed by a managed buffer.
  • Contract errors can now be triggered immediately, without the need to return them from an endpoint.
• Improved macro preprocessor: more complex patterns can now be substituted.
  • Generic API parameter needs not be specified every time.
  • Substitutions available for most managed types and storage mappers.
• Separated contract API into low-level VM API connectors and high-level utility objects to be used in the contracts.
• Mandos-rs improvements:
  • Self tests synchronized with mandos-go. Some missing features needed to be added to make them pass.
  • Support for ESDT tokens.
  • Support for ESDT multi-transfer.