code: @Override
      public boolean translate(final int codepoint, final Writer out) throws IOException {
          if (between) {
              if (codepoint < below || codepoint > above) {
                  return false;
              }
          } else {
              if (codepoint >= below && codepoint <= above) {
                  return false;
              }
          }
  
          // TODO: Handle potential + sign per various Unicode escape implementations
          if (codepoint > 0xffff) {
              out.write(toUtf16Escape(codepoint));
          } else {
            out.write("\\u");
            out.write(HEX_DIGITS[(codepoint >> 12) & 15]);
            out.write(HEX_DIGITS[(codepoint >> 8) & 15]);
            out.write(HEX_DIGITS[(codepoint >> 4) & 15]);
            out.write(HEX_DIGITS[(codepoint) & 15]);
          }
          return true;
      }
docs: {@inheritDoc}