ProtoLanguageFileWriter unable to write specific message options

[alexvanboxel]

Both message option are symaticly the same, but the ProtoLanguageFileWriter is unable to write the first version out (they have a different binary representation).

message Message {
    option (package.field).version = "1.2";
    option (package.field).description = "test description";

vs

message Message {
	option (package.field) = {
		version: "1.2"
		description: "test  description"
	};