- add support for generic union
- switch CI to the supported versions of ubuntu and macos
- install openssl on macos for Nim devel
- update github actions to v3
- improve union validation
- enable ssSize of union
- implement SSZ Optionals (EIP-6475)
- implement sszSize of Optionals
- use Nim 2.0 in CI
- test both refc and ORC in post-1.6 Nim versions
- stop testing Nim pre-1.6 in CI
- update for latest `Optional` spec
- avoid ptr_arith
- remove redundant when's because Nim 1.6+ is always true
- rm unused `SszMaxSizeExceeded`
- remove Defect raises
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