private final CharsetEncoder encoder;
  private final byte[] singleByte = new byte[1];

  /**
   * charBuffer holds characters that have been read from the Reader but not encoded yet. The buffer
   * is perpetually "flipped" (unencoded characters between position and limit).
   */
  private CharBuffer charBuffer;

  /**
   * byteBuffer holds encoded characters that have not yet been sent to the caller of the input

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