src/main/java/org/apache/commons/lang3/stream/Streams.java [87:104]:
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        @Override
        public BinaryOperator<List<O>> combiner() {
            return (left, right) -> {
                left.addAll(right);
                return left;
            };
        }

        @Override
        public Function<List<O>, O[]> finisher() {
            return list -> {
                @SuppressWarnings("unchecked")
                final O[] array = (O[]) Array.newInstance(elementType, list.size());
                return list.toArray(array);
            };
        }

        @Override
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src/main/java/org/apache/commons/lang3/Streams.java [464:481]:
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        @Override
        public BinaryOperator<List<O>> combiner() {
            return (left, right) -> {
                left.addAll(right);
                return left;
            };
        }

        @Override
        public Function<List<O>, O[]> finisher() {
            return list -> {
                @SuppressWarnings("unchecked")
                final O[] array = (O[]) Array.newInstance(elementType, list.size());
                return list.toArray(array);
            };
        }

        @Override
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