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3.1 The argument/local variable name suggestions for arrays include the plural of the element type (e.g. 'numbers' for a 'Number[]'). I would ask for the same functionality for parameterized subtypes of java.util.Collection. As element name, the upper bound of the type parameter should be taken: Example: suggest 'numbers' for 'java.util.List<Number>' or 'java.util.HashSet<? extends Number>' (but not for 'List<? super Number>').