なぜ message2でだけas [String : Any]が必要だと言われるのだろう？ @swift-4.1.3

let content = "" let fields = [["name": "stdout.txt", "value": ""]] let message1 = fields.isEmpty ? ["content": content] : ["content": content, "embed": ["fields": fields]] let message2 = ["content": content, "embed": ["fields": fields]]