Incorrect dump of Date when in a nested structure

[nmk]

 $ jirb
 :001 > require 'date'
 => true
 :002 > require 'jrjackson'
 => true
 :003 > JrJackson::Json.dump(Date.today)
 => "2016-01-11"
 :004 > JrJackson::Json.dump([Date.today])
 => "[\"2016-01-11 00:00:00 +0100\"]"

The above session uses JrJackson 0.3.8 and JRuby 1.7.21. I am aware of #29 and https://github.com/guyboertje/jrjackson/wiki/Ruby-Time-serialisation however this concerns only dates. As far as I know dates should be TZ unaware, so the generation of a date should always result in a string of the "YYYY-MM-DD" format.