kubernetes/vendor/github.com/google/go-cmp/cmp/internal/value/sort.go

// SortKeys sorts a list of map keys, deduplicating keys if necessary.
// The type of each value must be comparable.
func SortKeys(vs []reflect.Value) []reflect.Value { … }

// isLess is a generic function for sorting arbitrary map keys.
// The inputs must be of the same type and must be comparable.
func isLess(x, y reflect.Value) bool { … }