kubernetes/vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/fold.go

// foldName returns a folded string such that foldName(x) == foldName(y)
// is similar to strings.EqualFold(x, y), but ignores underscore and dashes.
// This allows foldName to match common naming conventions.
func foldName(in []byte) []byte { … }

func appendFoldedName(out, in []byte) []byte { … }

// foldRune is a variation on unicode.SimpleFold that returns the same rune
// for all runes in the same fold set.
//
// Invariant:
//
//	foldRune(x) == foldRune(y) ⇔ strings.EqualFold(string(x), string(y))
func foldRune(r rune) rune { … }