Fields wrongly serialized

[satabin]

When saving bulks documents containing lists of strings, they are not correctly serialized. Strings are not escaped. For example saving bulk documents described as follows:

case class Doc(_id: String, value: List[String]) extends IdRev

val db = ...

val docs =
  List(
    Doc("id1", List("string1", "string2")),
    Doc("id2", List("string1", "string2"))
  )

db.saveDocs(docs)

docs gets serialized as

[
  {
    "_id": "id1",
    "value": [ "\"string1\"", "\"string2\"" ]
  },
  {
    "_id": "id2",
    "value": [ "\"string1\"", "\"string2\"" ]
  }
]

but should be serialized as:

[
  {
    "_id": "id1",
    "value": [ "string1", "string2" ]
  },
  {
    "_id": "id2",
    "value": [ "string1", "string2" ]
  }
]