/**
* The version number of this document. If an optional versioned text document
* identifier is sent from the server to the client and the file is not
* open in the editor (the server has not received an open notification
* before) the server can send `null` to indicate that the version is
* known and the content on disk is the master (as specified with document
* content ownership).
*
* The version number of a document will increase after each change,
* including undo/redo. The number doesn't need to be consecutive.
*/
using lsOptionalVersionedTextDocumentIdentifier = lsVersionedTextDocumentIdentifier;