const unicode.UpperCase

4 uses

	unicode (current package)
		letter.go#L71: 	UpperCase = iota
		letter.go#L275: 	return To(UpperCase, r)
		letter.go#L302: 	r1, hadMapping := to(UpperCase, r, []CaseRange(special))
		letter.go#L385: 		return convertCase(UpperCase, r, cr)