tools/src/container/key.go

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package container

// key is the constraint for container keys.
// As Map and Set sort before returning a slice, the constraint is equivalent to
// the constraints.Ordered in x/exp, instead of 'comparable':
// https://cs.opensource.google/go/x/exp/+/master:constraints/constraints.go
type key interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 |
		~uint32 | ~uint64 | ~uintptr | ~float32 | ~float64 | ~string
}