a:    "CHUNKED",
			b:    "chunked",
			want: true,
		},
		{
			name: "same string",
			a:    "chunked",
			b:    "chunked",
			want: true,
		},
		{
			name: "Unicode Kelvin symbol",
			a:    "chunKed", // This "K" is 'KELVIN SIGN' (\u212A)
			b:    "chunked",
			want: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := EqualFold(tt.a, tt.b); got != tt.want {

				}
			}
			t = t[1:]
			continue
		}
		// sb is ASCII and t is not. t must be either kelvin
		// sign or long s; sb must be s, S, k, or K.
		tr, size := utf8.DecodeRune(t)
		switch sb {
		case 's', 'S':
			if tr != smallLongEss {
				return false
			}
		case 'k', 'K':
			if tr != kelvin {
				return false
			}
		default:
			return false
		}
		t = t[size:]

	}

var streamTest = []any{
	0.1,
	"hello",
	nil,
	true,
	false,
	[]any{"a", "b", "c"},
	map[string]any{"K": "Kelvin", "ß": "long s"},
	3.14, // another value to make sure something can follow map
}

var streamEncoded = `0.1
"hello"
null
true
false
["a","b","c"]
{"ß":"long s","K":"Kelvin"}
3.14
`

func TestEncoder(t *testing.T) {
	for i := 0; i <= len(streamTest); i++ {
		var buf strings.Builder

	fmt.Printf("%#U\n", unicode.SimpleFold('a'))      // 'A'
	fmt.Printf("%#U\n", unicode.SimpleFold('K'))      // 'k'
	fmt.Printf("%#U\n", unicode.SimpleFold('k'))      // '\u212A' (Kelvin symbol, K)
	fmt.Printf("%#U\n", unicode.SimpleFold('\u212A')) // 'K'
	fmt.Printf("%#U\n", unicode.SimpleFold('1'))      // '1'

	// Output:
	// U+0061 'a'
	// U+0041 'A'
	// U+006B 'k'
	// U+212A 'K'

      verifyHostname(hostname, it)
    }
  }

  /**
   * This is like [toLowerCase] except that it does nothing if this contains any non-ASCII
   * characters. We want to avoid lower casing special chars like U+212A (Kelvin symbol) because
   * they can return ASCII characters that match real hostnames.
   */
  private fun String.asciiToLowercase(): String {
    return when {
      isAscii() -> lowercase(Locale.US) // This is an ASCII string.

	// 0133;LATIN SMALL LIGATURE IJ;Ll;0;L;<compat> 0069 006A;;;;N;LATIN SMALL LETTER I J;;0132;;0132
	{UpperCase, 0x0133, 0x0132},
	{LowerCase, 0x0133, 0x0133},
	{TitleCase, 0x0133, 0x0132},

	// 212A;KELVIN SIGN;Lu;0;L;004B;;;;N;DEGREES KELVIN;;;006B;
	{UpperCase, 0x212A, 0x212A},
	{LowerCase, 0x212A, 'k'},
	{TitleCase, 0x212A, 0x212A},

	// From an UpperLower sequence
	// A640;CYRILLIC CAPITAL LETTER ZEMLYA;Lu;0;L;;;;;N;;;;A641;

// If r is not a valid Unicode code point, SimpleFold(r) returns r.
//
// For example:
//
//	SimpleFold('A') = 'a'
//	SimpleFold('a') = 'A'
//
//	SimpleFold('K') = 'k'
//	SimpleFold('k') = '\u212A' (Kelvin symbol, K)
//	SimpleFold('\u212A') = 'K'
//
//	SimpleFold('1') = '1'
//
//	SimpleFold(-2) = -2
func SimpleFold(r rune) rune {
	if r < 0 || r > MaxRune {
		return r
	}

// form an upper/lower pair.
// For example, U+004B ('K'), U+006B ('k'), and U+212A ('K' for Kelvin)
// are three distinct runes that case-fold to each other.
// When we do add Unicode letters, we must not assume that upper/lower
// are the only case-equivalent pairs.
// Perhaps the Kelvin symbol would be disallowed entirely, for example.
// Or perhaps it would escape as "!!k", or perhaps as "(212A)".
//

}

var foldcaseTests = []parseTest{
	{`AbCdE`, `strfold{ABCDE}`},
	{`[Aa]`, `litfold{A}`},
	{`a`, `litfold{A}`},

	// 0x17F is an old English long s (looks like an f) and folds to s.
	// 0x212A is the Kelvin symbol and folds to k.
	{`A[F-g]`, `cat{litfold{A}cc{0x41-0x7a 0x17f 0x212a}}`}, // [Aa][A-z...]
	{`[[:upper:]]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
	{`[[:lower:]]`, `cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}`},
}

    // These should ideally be false, but we know that hostname is usually already checked by us
    assertThat(verifier.verify("\u212A.com", session)).isFalse()
    // Kelvin character below
    assertThat(verifier.verify("K.com", session)).isFalse()
  }

  @Test fun specialKInCert() {
    // https://github.com/apache/httpcomponents-client/commit/303e435d7949652ea77a6c50df1c548682476b6e