Github user cakofony commented on the issue:
https://github.com/apache/logging-log4j2/pull/124
I would like to update MapMessage to take advantage of
`PatternFormatter.recursiveDeepToString` for more efficient value handling, but
I think that makes sense in a follow up commit.
I've got several MapMessage changes in review at the moment, so it's
difficult to push other fixes without stomping on my own feet!---
