Checking out the first example—object pools—I was initially blown away that this is not only possible but it produces no warnings of any kind:
pool := sync.Pool{
New: func() any { return 42 }
}
a := pool.Get()
pool.Put("hello")
pool.Put(struct{}{})
b := pool.Get()
c := pool.Get()
d := pool.Get()
fmt.Println(a, b, c, d)
Of course, the answer is that this API existed before generics so it just takes and returns `any` (née `interface{}`). It just feels as though golang might be strongly typed in principle, but in practice there are APIs left and rigth that escape out of the type system and lose all of the actual benefits of having it in the first place.
Is a type system all that helpful if you have to keep turning it off any time you want to do something even slightly interesting?
Also I can't help but notice that there's no API to reset values to some initialized default. Shouldn't there be some sort of (perhaps optional) `Clear` callback that resets values back to a sane default, rather than forcing every caller to remember to do so themselves?
484
161