import "golang.design/x/chann"

ch := chann.New[int]()                  // unbounded, capacity unlimited
ch := chann.New[func()](chann.Cap(0))   // unbufferd, capacity 0
ch := chann.New[string](chann.Cap(100)) // buffered,  capacity 100

ch.In() <- 42
println(<-ch.Out()) // 42

ch.Close()

ch.Len() // the length of the channel
ch.Cap() // the capacity of the channel