Method __init__

traitlets/traitlets.py:2388–2389

(self, **kwargs: t.Any)

    info_text = "an instance of the same type as the receiver or None"

    def __init__(self, **kwargs: t.Any) -> None:
        super().__init__(None, **kwargs)

    def validate(self, obj: t.Any, value: t.Any) -> HasTraits | None:
        # What if value is a superclass of obj.__class__?  This is