• Replaces the get_actor_code_cid with a get_actor_type precompile. This new precompile returns a number describing the actor type and will be stable across network upgrades.
• Includes multiple fixes to the exported actor APIs.
• Implements solidity "transfer" logic so that "sending" without gas won't simply fail.
• Includes an entirely new datastructure for storing contract data (trading off better performance for contracts with larger state, with reduced performance for contracts with less state).
• Change the call_actor precompile to:
  • Only be callable via DELEGATECALL.
  • Take an explicit value and flags parameter. Specifically, it now takes:
    • As u256 values: Method, value, flags, codec, address_length, params_length
    • Followed by the address and params.