v2.0.0

Other Changes

• Store fetched byte extents instead of a 256 KiB chunk grid (46eb560)
• Move the tests and diagrams onto extents (e3cb559)
• Fuzz random concurrent reads against the extent cache (6be3164)
• Describe the extent cache in the README and docs (1509965)
• Fix what two reviews of the extent cache found (d76ddf7)
• Fuzz aborts in the same tick and the same turn as the read (748343a)

Full changelog: v1.6.0...v2.0.0