static File createTempFile() {
  ret createTempFile("tmp", null);
}

static File createTempFile(S prefix, S suffix) ctex {
  prefix = nohup_sanitize(prefix);
  suffix = nohup_sanitize(suffix);
  if (shouldKeepTempFiles())
    ret mkdirsForFile(javaxCachesDir("Temp/" + prefix + "-" + randomID() + "-" + suffix));
  // File.createTempFile needs at least 3 prefix characters, so we
  // fíll them up for you
  File f = File.createTempFile(takeFirst(10, pad(prefix, 3, '-')), suffix);
  f.deleteOnExit();
  ret f;
}