extensions/markdown-language-features/server/src/workspace.ts/VsCodeDocument/constructor
class VsCodeDocument:	constructor(uri: string, init: { inMemoryDoc?: TextDocument; onDiskDoc?: TextDocument }) {
		this.uri = uri;
		this.inMemoryDoc = init?.inMemoryDoc;
		this.onDiskDoc = init?.onDiskDoc;
	}