Simplify array copy to collection.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1585170 13f79535-47bb-0310-9956-ffa450edef68
Add explicit warning suppression for "redundant" cast.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1585174 13f79535-47bb-0310-9956-ffa450edef68
Add some documentation clarification.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1585180 13f79535-47bb-0310-9956-ffa450edef68