List or ArrayList/concrete type

at the beginning of my gwt adventure i read somewhere that it is better to use concrete classes for interfaces like lists, because the gwt compiler must generate java script for every kind of list.

Is this (still) true? I asked because by using arraylist/concrete types everywhere on client side yields a lot of "loose coupling" warnings from sonar and beside this it is the absolute opposite of the make-(gwt)-code-more-testable-by-using-interfaces-as-much-as-possible-philosophy.

thx in advance

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