svoid smartZipCompressionLevel(ZipOutputStream zip, File f) {
  smartZipCompressionLevel(zip, fileName(f));
}

svoid smartZipCompressionLevel(ZipOutputStream zip, S fileName) {
  int level = Deflater.DEFAULT_COMPRESSION;
  if (isImageFileName(fileName) || eqicOneOf(fileExtension(fileName), ".zip", ".jar", ".gz", ".bin")) // assume .bin is a jar snippet or some such
    level = Deflater.NO_COMPRESSION;
  zip.setLevel(level);
}