There is an example: https://go.dev/play/p/guzOWRKi-yp
```
func (c *cachedFn[string, V]) Get0() (V, error) {
// var s any
var s string
s = "abc" // error: cannot use "abc" (untyped string constant) as string
value in assignment
fmt.Printf("cache key: %#v, %T\n", s, s) // cache key: 0, uint8
return c.Get(s)
}
```
I find the generic type of the struct method a bit confusing.
1. The type `cachedFn[string, V]` does not really constrain the type of
`s` to **string**. It's actual type is `uint8`
2. And this error is a bit strange. (`s = "abc" // error: cannot use "abc"
(untyped string constant) as string value in assignment. ` )
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