Return Type Declarations

[joshbonnick]

Apologies if this has already been asked and answered, however I could not find anything.

The Coding Style section of the contribution guide states @param and @return should be omitted when they are redundant due to the native types.

Throughout the framework we do the opposite, for example the Stringable API.

Is there a reason for not adding the type declarations or would a pull request be welcome to add the type declarations throughout the framework? Likely targeted at version 11 or even 12 to avoid breaking changes on users extending the updated classes.