I just learned that type constraints, which are defined as interfaces are
actually not usable in all the places "normal" interfaces can be used in.
E.g., why can a constraint interface not be uses as a struct type?
Let's say I have the func `func Smallest[T constraints.Ordered](s []T) T`.
How do I write a table test for this func? Intuitively one would try to
store tests like this:
tests := []struct {
Arr: []constraints.Ordered
Want: constraints.Ordered
}{...}
But this is not permitted. Am I missing something why this behavior is
should be considered good? If a type constraint is nothing like an
interface... okay, but why call it interface then?
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