Decisions

1. Dependency resolving is sync only (since 2.x version)
2. Cached factories are thread-safe for concurrent resolving (threading.Lock is used)
3. No global state -> all state lives in registries of containers
4. Focus on maximum type safety:
5. No need for # type: ignore
6. No need for typing.cast
7. No adding new features while tasks can be solved by current implementation.