src/vs/workbench/services/workingCopy/common/workingCopyBackupService.ts/WorkingCopyBackupServiceImpl/createPreamble
class WorkingCopyBackupServiceImpl:	private createPreamble(identifier: IWorkingCopyIdentifier, meta?: IWorkingCopyBackupMeta): string {
		return `${identifier.resource.toString()}${WorkingCopyBackupServiceImpl.PREAMBLE_META_SEPARATOR}${JSON.stringify({ ...meta, typeId: identifier.typeId })}${WorkingCopyBackupServiceImpl.PREAMBLE_END_MARKER}`;
	}