common Undefined¶ Undefined Deprecated¶ This functionality is deprecated in the BSON specification. See https://bsonspec.org/spec.html The undefined value. See also¶ BsonValue.decodeUndefined: Read this type. BsonFieldWriter.writeUndefined: Write this type. Properties¶ code¶ val code: Byte The byte identifier for this particular type. Guaranteed to be in the range -1 (MinKey) to 127 (MaxKey). name¶ expect val name: String ordinal¶ expect val ordinal: Int