if !ok {
		// This is a good time to initialize cleanup, since we must go through
		// this path on the first use of Make, and it's not on the hot path.
		setupMake.Do(registerCleanup)
		ma = addUniqueMap[T](typ)
	}
	m := ma.(*uniqueMap[T])

	// Keep around any values we allocate for insertion. There
	// are a few different ways we can race with other threads
	// and create values that we might discard. By keeping