Ledger Team Update

High level summary

Aside from more testing and overall quality-of-life improvements on the ledger test suite side, we have implemented a couple of important features that will be enabled after the next intra-era hard fork:

• Translation of RegTxCert and UnRegTxCert to PlutusV3 scripts context will now be done correctly, which means deposit and refund respectively, will actually be translated.
• Treasury withdrawals that are empty or sum up to zero will no longer be allowed.

Some performance improvements and a bug fix to a ledger event were also implemented during this period.

Low level summary

Features

• pull-4623 - Change GovInfoEvent's "unclaimed" field from Set to a Map
• pull-4627 - Fix Conway implementation of RegTxCert and UnRegTxCert
• pull-4643 - Improve certificate performance
• pull-4630 - Disallow empty withdrawals
• pull-4646 - Don't return ZeroTreasuryWithdrawals failure during bootstrap

Testing

• pull-4497 - Show coloured tree-diff output in ImpTests
• pull-4615 - Prevent HSpec from messing with ImpSpec colors
• pull-4625 - Additional DELEG tests
• pull-4599 - Move TxInfo golden tests to new package
• pull-4629 - Add TxInfo golden test for Conway
• pull-4575 - Ts salvage newtylespecs

Infrastructure and releasing

• pull-4624 - Remove upper bound on plutus-ledger-api
• pull-4626 - Fix CODEOWNERS
• pull-4638 - Implement ghc heap limiting and retrying in CI
• pull-4644 - Cardano ledger conway 1.16.2.0