feat: no longer require branch to have more than one end nodes (#263)

Author: shentongmartin

compose/graph.go

@@ -454,10 +454,6 @@ func (g *graph) addBranch(startNode string, branch *GraphBranch, skipData bool)
 		return fmt.Errorf("branch start node '%s' needs to be added to graph first", startNode)
 	}
 
-	if len(branch.endNodes) == 1 {
-		return fmt.Errorf("number of branches is 1")
-	}
-
 	if _, ok := g.handlerPreBranch[startNode]; !ok {
 		g.handlerPreBranch[startNode] = [][]handlerPair{}
 	}

internal/concat.go

@@ -72,8 +72,8 @@ func RegisterStreamChunkConcatFunc[T any](fn func([]T) (T, error)) {
 	concatFuncs[generic.TypeOf[T]()] = fn
 }
 
-func GetConcatFunc(tpe reflect.Type) func(reflect.Value) (reflect.Value, error) {
-	if fn, ok := concatFuncs[tpe]; ok {
+func GetConcatFunc(typ reflect.Type) func(reflect.Value) (reflect.Value, error) {
+	if fn, ok := concatFuncs[typ]; ok {
 		return func(a reflect.Value) (reflect.Value, error) {
 			rvs := reflect.ValueOf(fn).Call([]reflect.Value{a})
 			var err error