This release includes the following changes:
- A new specs-actors with a major refactor of the miner actor (#2413)
- A new go-fil-markets with a major data transfer rewrite (filecoin-project/go-data-transfer#55, filecoin-project/go-fil-markets#321)
- An overhaul of the mechanisms that charge gas during VM execution (#2343)
- The ability to mark sectors as "Committed Capacity", and later upgrading them with deals (#2220)
- The ability to mark deals as for "fast-retrieval", which instructs miners to store an unsealed copy (#2323)
- The ability to pack multiple deals into a sector (filecoin-project/storage-fsm#38)
- Various bugfixes, performance improvements, and new API endpoints