[Question] @Constant/@Value are not available inside the constructor
## Information

- **Version:** 7.34.2
- Packages:

When using `@Constant` or `@Value` to inject the configuration into a client/service, the value is `undefined` inside the constructor. 

## Example

For example, I have

```ts
@Service()
export class GoogleClient {
  @Constant('sso.google')
  config: GoogleSSOConfig;

  constructor() {
    console.log(this.config);
  }

  doSomething() {
    console.log(this.config);
  }
```

In the example above, when the app boots, the constructor prints `undefined` but when I call `doSomething()` the config value exists. How come?

## Acceptance criteria

- [ ] Criteria 1
