[go-nuts] Constrain a type to be either a slice or a map

[RussellLuo]

Hi there,

Thanks to Go generics in 1.18, I can write a generic function `LenBetween` 
for a slice:

```go
func SliceLenBetween[T ~[]E, E any](s T, min, max int) bool {
        return len(s) >= min && len(s) <= max
}
```

as well as for a map:

```go
func MapLenBetween[T map[K]V, K comparable, V any](s T, min, max int) bool {
        return len(s) >= min && len(s) <= max
}
```

Is there any way to write a constraint, say, SliceOrMap, to support either 
a slice or a map?

With the help of SliceOrMap, then I can write a more generic version 
`LenBetween` like this:

```go
func MapLenBetween[T SliceOrMap](s T, min, max int) bool {
        return len(s) >= min && len(s) <= max
}
```

Thanks in advance!

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