src/vs/workbench/api/common/extHostComments.ts/ExtHostCommentController/createCommentThread
class ExtHostCommentController:		createCommentThread(arg0: vscode.Uri | string, arg1: vscode.Uri | vscode.Range, arg2: vscode.Range | vscode.Comment[], arg3?: vscode.Comment[]): vscode.CommentThread {
			if (typeof arg0 === 'string') {
				const commentThread = new ExtHostCommentThread(this.id, this.handle, arg0, arg1 as vscode.Uri, arg2 as vscode.Range, arg3 as vscode.Comment[], this._extension);
				this._threads.set(commentThread.handle, commentThread);
				return commentThread;
			} else {
				const commentThread = new ExtHostCommentThread(this.id, this.handle, undefined, arg0 as vscode.Uri, arg1 as vscode.Range, arg2 as vscode.Comment[], this._extension);
				this._threads.set(commentThread.handle, commentThread);
				return commentThread;
			}
		}