Should we support a way to define default link's value?

[Konard]

Should it be an architectural change or it can be done as an optional package?

If it is optional package, than we can implement it as a decorator for DeepClient.

For example we can have a default value for a link as 0 or 10 or any other.
Then if we do not store value for that link, and default value is not empty if we try to load a value, using value relationship we will get that value even if for that link value was never specified after the creation.