v0.9.0

StarkNet:

• Enforce fees - max_fee must not be set to zero, and selector must be __execute__
• Split the concepts of contract class and contract instance. See here
  • Add declare transaction type
  • New API and CLI commands:
    • declare - Declares a contract class
    • get_class_by_hash - Returns the contract class given its hash
    • get_class_hash_at - Returns the class hash for a given contract instance address
  • Rename delegate_call to library_call, and change the contract address argument to class hash. See here
• Add a deploy system call. See here
• Rename ContractDefinition to ContractClass
• Reduce the compiled contract file's size by removing unnecessary identifiers (this optimization can be disabled using --dont_filter_identifiers)

Cairo:

• Initial support for the "EC-op" builtin (scalar multiplication over the STARK curve). Not supported in StarkNet yet.
• Add additional helper methods to blake2s.cairo, including big-endian support
• Technical changes:
  • Change function's return type from a struct to a named tuple. In particular, foo.Return.SIZE is no longer supported.