message: forwarding IDLOptions.strict_json to flexbuffers .ToString()
diff: @@ -178,7 +178,7 @@ static bool GenFieldOffset(const FieldDef &fd, const Table *table, bool fixed,
  } else if (fd.flexbuffer) {
  auto vec = table->GetPointer<const Vector<uint8_t> *>(fd.value.offset);
  auto root = flexbuffers::GetRoot(vec->data(), vec->size());
  - root.ToString(true, false, *_text);
  + root.ToString(true, opts.strict_json, *_text);
  return true;
  } else {
  val = IsStruct(fd.value.type)
  