}
      }

    fun username(username: String) =
      apply {
        this.encodedUsername = username.canonicalize(encodeSet = USERNAME_ENCODE_SET)
      }

    fun encodedUsername(encodedUsername: String) =
      apply {
        this.encodedUsername =
          encodedUsername.canonicalize(
            encodeSet = USERNAME_ENCODE_SET,
            alreadyEncoded = true,
          )
      }

      }
    }

  private fun testParseAlreadyEncoded(
    codePoint: Int,
    encoding: Encoding,
    component: Component,
  ) {
    val expected = component.canonicalize(encoding.encode(codePoint))
    val urlString = component.urlString(expected)
    val url = urlString.toHttpUrl()
    val actual = component.encodedValue(url)
    if (actual != expected) {

      writeByte(' '.code)
      i++
      continue
    }
    writeUtf8CodePoint(codePoint)
    i += Character.charCount(codePoint)
  }
}

internal fun String.canonicalize(
  pos: Int = 0,
  limit: Int = length,
  encodeSet: String,
  alreadyEncoded: Boolean = false,
  strict: Boolean = false,
  plusIsSpace: Boolean = false,
  unicodeAllowed: Boolean = false,
): String =

    .writeDecimalLong((address[3] and 0xff).toLong())
    .readUtf8()
}

/**
 * If this is an IP address, this returns the IP address in canonical form.
 *
 * Otherwise, this performs IDN ToASCII encoding and canonicalize the result to lowercase. For
 * example this converts `☃.net` to `xn--n3h.net`, and `WwW.GoOgLe.cOm` to `www.google.com`.
 * `null` will be returned if the host cannot be ToASCII encoded or if the result contains

   * assertNull(getEffectiveTldPlusOne("com"));
   * assertNull(getEffectiveTldPlusOne("localhost"));
   * assertNull(getEffectiveTldPlusOne("mymacbook"));
   * ```
   *
   * @param domain A canonicalized domain. An International Domain Name (IDN) should be punycode
   *     encoded.
   */
  fun getEffectiveTldPlusOne(domain: String): String? {
    // We use UTF-8 in the list so we need to convert to Unicode.