Merge pull request #3047 from planetarium/release/1.19.4 · planetarium/lib9c@cb3d878

Build: .Libplanet/src/Libplanet.Store/BlockSet.cs#L160

Converting null literal or possible null value to non-nullable type.

Build: Lib9c.Policy/NCStagePolicy.cs#L144

Nullability of reference types in type of parameter 'x' of 'int TxComparer.Compare(Transaction x, Transaction y)' doesn't match implicitly implemented member 'int IComparer<Transaction>.Compare(Transaction? x, Transaction? y)' (possibly because of nullability attributes).

Build: Lib9c.Policy/NCStagePolicy.cs#L144

Nullability of reference types in type of parameter 'y' of 'int TxComparer.Compare(Transaction x, Transaction y)' doesn't match implicitly implemented member 'int IComparer<Transaction>.Compare(Transaction? x, Transaction? y)' (possibly because of nullability attributes).

Build: Lib9c.Policy/NCStagePolicy.cs#L42

Possible null reference return.

Build: Lib9c.Policy/Policy/DebugPolicy.cs#L22

Possible null reference return.

Build: Lib9c.Policy/Policy/DebugPolicy.cs#L28

Possible null reference return.

Build: Lib9c.Policy/Policy/MinBlockProtocolVersionPolicy.cs#L25

Cannot convert null literal to non-nullable reference type.

Build: Lib9c.Policy/Policy/MinBlockProtocolVersionPolicy.cs#L33

Cannot convert null literal to non-nullable reference type.

Build: Lib9c.Policy/Policy/SpannedSubPolicy.cs#L45

Cannot convert null literal to non-nullable reference type.