Pretty printing arrays yields invalid json

[potmo]

pretty printing a .JSArray is missing the opening brace like:

"something": 
{
   "a": "a",
   "b": "b",
   "c": "c"
}
]

when this is expected

"something": 
[
{
   "a": "a",
   "b": "b",
   "c": "c"
}
]

A possible fix is to replace line 251 of JSValue with:
case .JSArray(let array): return "[\(newline)" + (array.map({ "\(nextIndent)\($0.prettyPrint(indent, level + 1))" })) .joinWithSeparator(",\(newline)") + "\(newline)\(currentIndent)]"