Common base class

Currently both DynamicCore and StaticCore extend HybridCore. This is a bit strange inheritance hierarchy in general, but it's especially stupid to check does a library extend any of these by using isinstance(library, HybridCore). It would be better to have a common base class named LibraryCore or RobotLibraryCore that all concrete lib cores extend. It would allow using isinstance(library, RobotLibraryCore).

Until this common base class is implemented, it's probably best to use isinstance(library, (HybridCore, DynamicCore, StaticCore)) with any generic code. That's both more explicit than just using isinstance(library, HybridCore) and also works if and when other cores don't anymore extend HybridCore.

まず、HybridCore、DynamicCore、StaticCore の定義と使用箇所を特定します。共有の LibraryCore または RobotLibraryCore が継承と汎用的な isinstance チェックにどのような影響を与えるかを確認します。具体的な core が、共通の型として HybridCore に依存せずに新しい基底クラスを共有していれば完了です。