added buffer argument to OfSeq and OfSeq2

of.go

@@ -59,7 +59,7 @@ func OfFunc[T any](ctx context.Context, buffer int, f func() T) <-chan T {
 func OfMap[K comparable, V, T any](m map[K]V, unmapper func(K, V) T) <-chan T {
 	out := make(chan T, len(m))
 
-	defer func() {
+	go func() {
 		defer close(out)
 		for k, v := range m {
 			out <- unmapper(k, v)
@@ -70,10 +70,10 @@ func OfMap[K comparable, V, T any](m map[K]V, unmapper func(K, V) T) <-chan T {
 }
 
 // OfSeq returns a channel containing all values provided by the iterator
-func OfSeq[T any](seq iter.Seq[T]) <-chan T {
-	out := make(chan T, 10)
+func OfSeq[T any](seq iter.Seq[T], buffer int) <-chan T {
+	out := make(chan T, buffer)
 
-	defer func() {
+	go func() {
 		defer close(out)
 		for v := range seq {
 			out <- v
@@ -85,10 +85,10 @@ func OfSeq[T any](seq iter.Seq[T]) <-chan T {
 
 // OfSeq2 returns a channel containing the return values of the unmapper function
 // when provided with the values of the iterator
-func OfSeq2[K comparable, V, T any](seq iter.Seq2[K, V], unmapper func(K, V) T) <-chan T {
-	out := make(chan T, 10)
+func OfSeq2[K comparable, V, T any](seq iter.Seq2[K, V], buffer int, unmapper func(K, V) T) <-chan T {
+	out := make(chan T, buffer)
 
-	defer func() {
+	go func() {
 		defer close(out)
 		for key, value := range seq {
 			out <- unmapper(key, value)