From: Sergey Beryozkin <sberyozkin_at_talend.com>
Date: Thu, 26 Jan 2012 10:32:36 +0000

It is a useful utility class, may be it's worth adding a constructor
which can be used to tell the map to treat the keys in a
case-insensitive way, given that MaltivaluedMap is expected to do it in
some cases.
Sergey