* optimize epoch transition via get_flag_index_deltas() and get_inactivity_penalty_deltas()
* directly mutate Altair info in {get,update}_flag_and_inactivity_deltas
When bumping to a more recent commit than the configured `branch`,
currently the lint error message is confusing:
```
fatal: error processing shallow info: 4
Submodule 'vendor/nim-chronos': Failed to fetch 'master':
```
This happens when the selected commit is more recent than the latest
one on the `branch`. Comparing the commit dates allows a better message.
The `is_next_sync_committee_known` helper allocates a fresh
`SyncCommittee` in the caller and `nimZeroMem`s it on each use.
Use `static` to compare against a compile-time zeroed copy instead.
This also should help reduce stack size far enough to link with Nim 2.0.
The CI signing node sometimes becomes overloaded, leading to late block.
```
{"lvl":"DBG","ts":"2023-09-05 23:46:34.515+01:00","msg":"REST request body has been sent","remote":"127.0.0.1:5201","request":"/api/v1/eth2/sign/0x82ad1b336ce728978983cbe7c7dd25f757fdc66536f3457cf9f0120c07943f8d464eec55fefcaef9c0d5da6e9f7c1443","size":549,"http_method":"POST"}
```
```
DBG 2023-09-05 23:46:36.098+01:00 Received request peer=127.0.0.1:51194 meth=POST uri=/api/v1/eth2/sign/0x82ad1b336ce728978983cbe7c7dd25f757fdc66536f3457cf9f0120c07943f8d464eec55fefcaef9c0d5da6e9f7c1443
```
Especially on the `minimal` preset with short slot timings, this leads
to attestations and sync duties being made for an old head, ultimately:
```
{"lvl":"FAT","ts":"2023-09-05 23:46:41.915+01:00","msg":"Low sync committee participation","topics":"chaindag","slot":15,"num_active_participants":8}
```
Looking at `nimbus_signing_node.0.jsonl` shows that the signing node is
very busy. Lowering the validator count should reduce the latency a bit.
In Nim 2.0, the `test_fixture_operations` files fail to compile with:
```
Error: 'result' is of type <Result[system.void, system.cstring]> which cannot be captured as it would violate memory safety, declared here: /nimbus-eth2/tests/consensus_spec/bellatrix/test_fixture_operations.nim(130, 5); using '-d:nimNoLentIterators' helps in some cases. Consider using a <ref Result[system.void, system.cstring]> which can be captured.
```
Wrapping the `applyExecutionPayload` in a factory that takes `path`
avoids this problem.
Nim 2.0 gets confused when compiling `all_tests`:
```
Error: undeclared identifier: 'maxLen'
candidates (edit distance, scope distance); see '--spellSuggest':
(3, 7): 'Table'
(3, 7): 'len'
(3, 7): 'max'
```
Renaming the generic parameter `U` to `maxLen` fixes this somehow.
It also increases readability to use the same name consistently.
In Nim 2.0, attempting to use `Taskpool.spawn` inside `{.async.}` `proc`
leads to `Error: cannot generate destructor for generic type: Isolated`.
Add an intermediate wrapper `proc` that performs the `spawn` operation
to workaround the problem.
Suite names were not being used because `test` has to have access to it
during instantiation - this PR cleans things up a little while at the
same time upgrading unittest2.
From old interop tests, a mock `eth1BlockHash` was defined in `base`.
To avoid accidental use by Nimbus, move to `tests` and rename it to
`mockEth1BlockHash`.
CI Lint check failed when bumping to a commit outside default shallow
range. Deepen the checkout through the bumped commit date to ensure
history is available for the ancestry check.
tersec
zah
Etan Kissling
Eugene Kabanov
Jacek Sieka
Tanguy