Hi Commons IO Developers, I noticed that StringBuilderWriter currently (in version 2.20.0) overrides Writer methods write(char[], int, int) and write(String), but does not override write(int). This means that whenever write(int) is called on a StringBuilderWriter instance, it falls back to the implementation in Writer, which is very costly compared to simply appending a char to a StringBuilder.
I suggest adding this method to StringBuilderWriter: @Override public void write(final int c) { builder.append((char) c); } Thanks & regards, Botond Kósa botond.k...@gmail.com