Interface vs implementation

Hi!

I am aware of the fact that the GWT best practices are slightly different from the regular java recommendations. There is one question i would like to clarify. I am aware of the fact that when writing RPCs than the best practice is to use implementations as a return value f.e. ArrayList instead of List, because using less-specific classes forces the GWT compiler to generate serialization code for every serializable subclass of List. This make sense! My question is regarding the regular Widgets or (Presenter+View), is this still true in case of the ui code? To have

private ArrayList<String> myList = new ArrayList<String>();

is more effective than,

private List<String> myList = new ArrayList<String>();

Does the GWT compiler generate the JavaScript for each subclass of the List?

Thank you very much!!!

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