StringUtils#join(T...): warning: [unchecked] Possible heap pollution from parameterized vararg type T

commons-lang3-3.4-src/src/main/java/org/apache/commons/lang3/StringUtils.java:3302: warning: [unchecked] Possible heap pollution from parameterized vararg type T
public static <T> String join(final T... elements) {
^

usage: String.join(" ", stringarray)