"AVOID using library private types in public APIs" - lint warning, even in in cookbook examples?

I noticed the style error warning

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pop up in some of my code but also in the some of the official Flutter/Dart documentation/cookbook examples; e.g. at

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for
```
...
class AnimatedContainerApp extends StatefulWidget {
const AnimatedContainerApp({super.key});

@override
_AnimatedContainerAppState createState() => _AnimatedContainerAppState();
}

class _AnimatedContainerAppState extends State<AnimatedContainerApp> {
...

```

[![example of warning][1]][1]


My understanding of OOP and its nomenclature is sketchy at best and I don't quite understand the warning, but my actual question is, are the examples with this warning wrong, or sub-ideal - or does that style issue only apply in certain contexts that is perhaps not relevant to the examples and or I should ignore it, or is it an result of flutter/dart versions or some such or other?





[1]:

From the [latest docs][1]:

Subclasses should override this method to return a newly created
instance of their associated [State] subclass:

@override
State<MyWidget> createState() => _MyWidgetState();

So you should replace

@override
_AnimatedContainerAppState createState() => _AnimatedContainerAppState();

with

@override
State<AnimatedContainerApp> createState() => _AnimatedContainerAppState();


[1]:

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