docs: @javax.annotation.Nonnull
    public String summarize(@javax.annotation.Nonnull String logSrc, final int maxLog) {
      if (logSrc.length() > maxLog * 2) {
        @javax.annotation.Nonnull final String prefix = logSrc.substring(0, maxLog);
        logSrc = prefix + String.format(
          (prefix.endsWith("\n") ? "" : "\n") + "~```\n~..." + file(logSrc, "skipping %s bytes") + "...\n~```\n",
          logSrc.length() - 2 * maxLog) + logSrc.substring(logSrc.length() - maxLog);
      }
      return logSrc;
    }