Way to implement empty_as_undefined ?

[CaptainDriftwood]

Is there a way to have empty collections be treated as Undefined upon serialization? In the same vein, is there a way to do this with empty/blank strings? (I know that str also implement the len method, curious if a default serialization could treat strings differently from collections in this regard)

[wyfo]

I think you can achieve that in two different ways:

• conditional field skipping
• serialized method/property (returning Undefined) with the same alias than the field (which will then be overridden).

[CaptainDriftwood]

Both those options have to be used at the field level on a dataclass. Is there no way to declare this type of behavior at the class level, or globally via a setting?