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## Benefits 1. **Type Safety**: Compile-time validation of required fields and proper type setting 2. **Less Boilerplate**: No need to manually set the `type` field or generate IDs 3. **Input Validation**: Runtime validation prevents common errors (e.g., base64 without MIME type) 4. **Consistent Patterns**: Standardized creation patterns across all block types 5. **Better Developer Experience**: Cleaner, more intuitive API than manual TypedDict construction. Also follows similar other patterns (e.g. `create_react_agent`, `init_chat_model`