func mime.isUTF8

3 uses

	mime (current package)
		encodedword.go#L86: 	if !isUTF8(charset) || base64.StdEncoding.EncodedLen(len(s)) <= maxContentLen {
		encodedword.go#L116: 	if !isUTF8(charset) {
		encodedword.go#L180: func isUTF8(charset string) bool {