unicodeAllowed: Boolean,
  charset: Charset?,
) {
  var encodedCharBuffer: Buffer? = null // Lazily allocated.
  var codePoint: Int
  var i = pos
  while (i < limit) {
    codePoint = input.codePointAt(i)
    if (alreadyEncoded &&
      (
        codePoint == '\t'.code ||
          codePoint == '\n'.code ||
          codePoint == '\u000c'.code ||
          codePoint == '\r'.code
      )
    ) {