code: public static void set(Map<String,Object> overlay, String key, Path path) throws IOException {
      Path finalPath = Files.exists(path, LinkOption.NOFOLLOW_LINKS) ?
          path.toRealPath(LinkOption.NOFOLLOW_LINKS) :
          path;
      overlay.put(key, "\"" + finalPath.toUri() + "\"");
    }
docs: Helper to set a {@link Path} value correctly for use with {@link #overlayOn(Map,Config)}.
  
  @param overlay key-value pairs to overlay on a {@link Config}
  @param key key to set
  @param path {@link Path} value
  @throws IOException if {@link Path} can't be made canonical