src/vs/workbench/services/workingCopy/common/workingCopyBackupService.ts/WorkingCopyBackupsModel/update
class WorkingCopyBackupsModel:	update(resource: URI, meta?: IWorkingCopyBackupMeta): void {
		const entry = this.cache.get(resource);
		if (entry) {
			entry.meta = deepClone(meta);
		}
	}