ElasticSearch: bug in output format of field of type "byte" when using ?fields= with document get.

gistfile1.txt

curl -XPOST "http://localhost:9200/my_index/my_type/_mapping" -d'
{
   "my_type": {
      "properties": {
         "byte_field": {"type": "byte"},
         "int_field": {"type": "integer"},
         "long_field": {"type": "long"}
      }
   }
}'

curl -XPOST "http://localhost:9200/my_index/my_type/1" -d'
{"byte_field":3, "int_field":4, "long_field":5}'

curl -XGET "http://localhost:9200/my_index/my_type/1?pretty=true"
# Returns:
#{
#   "_index": "my_index",
#   "_type": "my_type",
#   "_id": "1",
#   "_version": 1,
#   "exists": true,
#   "_source": {
#      "byte_field": 3,
#      "int_field": 4,
#      "long_field": 5
#   }
#}

curl -XGET "http://localhost:9200/my_index/my_type/1?fields=byte_field,int_field,long_field&pretty=true"
# Returns:
#{
#   "_index": "my_index",
#   "_type": "my_type",
#   "_id": "1",
#   "_version": 1,
#   "exists": true,
#   "fields": {
#      "int_field": 4,
#      "long_field": 5,
#      "byte_field": "3"
#   }
#}

The issue is the string value of "byte_field" in the last request.