ReaderInputStream(Reader reader, Charset charset, int bufferSize) {
    this(
        reader,
        charset
            .newEncoder()
            .onMalformedInput(CodingErrorAction.REPLACE)
            .onUnmappableCharacter(CodingErrorAction.REPLACE),
        bufferSize);
  }

  /**
   * Creates a new input stream that will encode the characters from {@code reader} into bytes using
   * the given character set encoder.
   *