Continuing https://github.com/scikit-learn/scikit-learn/pull/12356 Related to https://github.com/scikit-learn/scikit-learn/pull/14640 1. When `None` is the default, we can just set it as default: ``` name: array-like of shape (n_samples,), default=None ``` 2. When the type of the ndarray is known: ``` name: int ndarray of shape (n_samples,) ```` CC @adrinjalali