const runtime.maxRune

3 uses

	runtime (current package)
		utf8.go#L11: 	maxRune   = '\U0010FFFF' // Maximum valid Unicode code point.
		utf8.go#L93: 			if rune3Max < r && r <= maxRune {
		utf8.go#L115: 	case i > maxRune, surrogateMin <= i && i <= surrogateMax:

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