message: reserve before appending to a string
  Summary: Process keep about 20% faster!
diff: @@ -53,6 +53,7 @@ std::string form_type_regex(std::string proguard_regex) {
  proguard_regex = "L**;";
  }
  std::string r;
  + r.reserve(2 * proguard_regex.size());
  for (size_t i = 0; i < proguard_regex.size(); i++) {
  const char ch = proguard_regex[i];
  // Convert % to a match against primvitive types without
  