Altair 1.1.0-alpha.4

[twoeths]

Is your feature request related to a problem? Please describe.

The new release of Altair spec is available at https://github.com/ethereum/eth2.0-specs/tree/v1.1.0-alpha.4

Spec test of v1.1.0-alpha.4 is available at https://github.com/ethereum/eth2.0-spec-tests/releases/tag/v1.1.0-alpha.4

part of #2388

[twoeths]

Beacon Chain [PR #2554]

• Use ALTAIR_FORK_EPOCH instead of ALTAIR_FORK_SLOT (Use ALTAIR_FORK_EPOCH instead of ALTAIR_FORK_SLOT ethereum/consensus-specs#2342)
• Provide function for starting cleanly from Altair specification (Simplify Altair "genesis" ethereum/consensus-specs#2323) => it's done in Altair sim tests #2529
• Altair comments and minor logic cleanups (Altair review ethereum/consensus-specs#2374) => reorder conditions in process_attestations, we did that already
• Remove sync committee aggregates list in favor if a single aggregate (Simplify sync committee aggregates ethereum/consensus-specs#2370)
• Adjust sync committee size and duration (Adjust sync committee size and duration ethereum/consensus-specs#2371)
• [Bugfix] Use stable sync committee indices when processing block rewards (Use stable sync committee indices when processing block rewards ethereum/consensus-specs#2394)
• Clarify fork upgrade conditions for Altair (Clarify fork upgrade conditions for Altair ethereum/consensus-specs#2404) => just some comments added, nothing to do
• Restrict sync committee period calculation boundaries (Restrict sync committee period calculation boundaries ethereum/consensus-specs#2406)
• Participation flag and incentive review (dankrad altair review -- extended and tested ethereum/consensus-specs#2399)
• Update inactivity penalty deltas processing (Update inactivity penalty deltas processing ethereum/consensus-specs#2395)
• Ensure indices are ordered [source, target, head] everywhere (ensure indices are ordered [source, target, head] everywhere ethereum/consensus-specs#2411)
• Map attestation participation to flag deltas in fork transition (Altair: carry-over prev epoch participation ethereum/consensus-specs#2373, Altair fork attestation translation tests ethereum/consensus-specs#2408)
• Enhanced Altair testing (add committee progress tests for non genesis case ethereum/consensus-specs#2334, Add fork transition spec tests ethereum/consensus-specs#2363)

Validator [PR #2554]

• Adjust subnet count to reflect smaller sync committees (Adjust subnet count to reflect smaller sync committees ethereum/consensus-specs#2376)
• Add logic for handling sync committee assignment off by one issue ( add logic for handling sync committee off by one issue ethereum/consensus-specs#2400)
• Update validator guide with restricted sync committee computation (Update validator guide with restricted sync committee computation ethereum/consensus-specs#2407)
• Return non-duplicated sync committee subnets (Return non-duplicated sync committee subnets ethereum/consensus-specs#2409)

Network [PR #2554]

• Respect subcommittees in gossip validations for Altair (Respect subcommittees in gossip validations for Altair ethereum/consensus-specs#2329)
• Add syncnets data to Altair MetaData (Add syncnets data to Altair MetaData ethereum/consensus-specs#2352)
• Minor naming cleanup (Minor altair cleanups ethereum/consensus-specs#2362)
• Add logic for handling sync committee assignment off by one issue ( add logic for handling sync committee off by one issue ethereum/consensus-specs#2400)
• BlocksByRange under weak subjectivity (BlocksByRange under WS ethereum/consensus-specs#2131) => opened BlocksByRange under WS #2556
• Remove ResourceUnavailable error code for more discussion (remove resourceunavailable for more discussion ethereum/consensus-specs#2413)

Sync Protocol [PR #2554]

• Updates to Altair light client sync protocol (Updates to Altair light client sync protocol ethereum/consensus-specs#2378)

[dapplion]

@tuyennhv 1.1.0-alpha.5 was just released. I think it includes a small fix from .4 https://github.com/ethereum/eth2.0-specs/releases/tag/v1.1.0-alpha.5