Round 2 / builtin-actors and ref-fvm maintenance 🔧

builtin-actors and ref-fvm are unique components of the Filecoin stack that are used by all current implementations (Lotus, Forest and Venus) to execute its messages. By nature, compiled releases of builtin-actors must be used by all implementations in order to be compatible. Likewise, ref-fvm is the executor engine component that currently has no alternative. Maintenance and careful handling of these components and their release lifecycle is critical to the security, stability and evolution of Filecoin.

• Security: as singular linchpins of the Filecoin stack, it is critical that the code and dependency supply chains be managed carefully so as to avoid the injection of insecure
• Stability: the chain must keep executing, messages must be processed, WindowPoST must be handled. Nowhere else in the Filecoin stack is more ongoing effort applied to ensuring the utmost code quality than in these two components.
• Evolution: Filecoin must grow, change and adapt. Adding new features and retiring old ones. These components are where the bulk of this work happens for the Filecoin L1 and FilOz bears responsibility for executing and assisting others to execute on this evolution.

Expanding the contributor base of these key Filecoin dependencies is a core goal of FilOz. During the period in question FilOz has implemented 8 FIPs, 3 by working alongside three separate parties in learning and contributing. 9 separate members of the FilOz team have contributed directly to writing code, reviewing, assisting the learning journey of third-parties, and shipping releases.