Consider a transformation from `Pod` to `SimplePod`:

```go
SimplePods := krt.NewSingleton[SimplePod](func(ctx krt.HandlerContext) *[]SimplePod {
    res := []SimplePod{}
    for _, pod := range krt.Fetch(ctx, Pod) {
        res = append(res, SimplePod{Name: pod.Name})
    }
    return &res
}) // Results in a Collection[[]SimplePod]
```

While this *works*, it is inefficient and complex to write.

  bool IsQuantizableResult(Operation *op, int index) {
    if (index < 0 || index >= static_cast<int>(op->getNumResults()))
      return false;
    Value res = op->getResult(index);
    return res.getType().isa<ShapedType>() &&
           res.getType().cast<ShapedType>().getElementType().isa<FloatType>();
  }

  // A method to retrieve the name for the given op.
  OperationToName op_to_name_;

	var res []T
	err := cache.ListAllByNamespace(n.informer.GetIndexer(), namespace, selector, func(i any) {
		cast := i.(T)
		if n.applyFilter(cast) {
			res = append(res, cast)
		}
	})

	// Should never happen
	if err != nil && features.EnableUnsafeAssertions {
		log.Fatalf("lister returned err for %v: %v", namespace, err)
	}
	return res
}

	default:
		if wc.acceptAll() {
			res = &watch.Event{
				Type:   watch.Modified,
				Object: curObj,
			}
			return res
		}
		curObjPasses := wc.filter(curObj)
		oldObjPasses := wc.filter(oldObj)
		switch {
		case curObjPasses && oldObjPasses:
			res = &watch.Event{
				Type:   watch.Modified,
				Object: curObj,
			}
		case curObjPasses && !oldObjPasses:
			res = &watch.Event{
				Type:   watch.Added,

		// plus we want to return whatever we can to the user.
		res, err := p.processEntry(p.proc, netnsObserved, desiredUIDs, entry)
		if err != nil {
			log.Debugf("error processing entry: %s %v", entry.Name(), err)
			continue
		}
		if res == nil {
			continue
		}
		pod := pods[res.uid]
		netns := &NetnsWithFd{
			netns: res.netns,
			fd:    res.netnsfd,
			inode: res.inode,
		}
		workload := WorkloadInfo{

	})
}

func testCheckResultFunc(t *testing.T, w watch.Interface, check func(actualEvent watch.Event)) {
	select {
	case res := <-w.ResultChan():
		obj := res.Object
		if co, ok := obj.(runtime.CacheableObject); ok {
			res.Object = co.GetObject()
		}
		check(res)
	case <-time.After(wait.ForeverTestTimeout):
		t.Errorf("time out after waiting %v on ResultChan", wait.ForeverTestTimeout)
	}
}

// func p256MovCond(res, a, b *P256Point, cond int)
// If cond == 0 res=b, else res=a
TEXT ·p256MovCond(SB),NOSPLIT,$0
	MOVD	res+0(FP), res_ptr
	MOVD	a+8(FP), a_ptr
	MOVD	b+16(FP), b_ptr
	MOVD	cond+24(FP), R3

	CMP	$0, R3
	// Two remarks:
	// 1) Will want to revisit NEON, when support is better
	// 2) CSEL might not be constant time on all ARM processors
	LDP	0*16(a_ptr), (R4, R5)

	res := DB.FirstOrCreate(&user, "name = ?", user.Name)
	if res.Error != nil || res.RowsAffected != 1 {
		t.Fatalf("first or create rows affect err:%v rows:%d", res.Error, res.RowsAffected)
	}

	res = DB.FirstOrCreate(&user, "name = ?", user.Name)
	if res.Error != nil || res.RowsAffected != 0 {
		t.Fatalf("first or create rows affect err:%v rows:%d", res.Error, res.RowsAffected)
	}
}

					currentID.Store(int32(tt.id))
					defer func() { currentID.Store(0) }()
				}
				res, _, err := clients[i].Exchange(m, addr)
				if res != nil {
					t.Log("size: ", len(res.Answer))
				}
				if err != nil {
					t.Errorf("Failed to resolve query for %s: %v", tt.host, err)
				} else {
					for _, answer := range res.Answer {
						if answer.Header().Class != dns.ClassINET {

func operandTypes(list []*operand) (res []Type) {
	for _, x := range list {
		res = append(res, x.typ)
	}
	return res
}

// varTypes returns the list of types for the given variables.
func varTypes(list []*Var) (res []Type) {
	for _, x := range list {
		res = append(res, x.typ)
	}
	return res
}

// typesSummary returns a string of the form "(t1, t2, ...)" where the