message: Increase float to string precision to 17
diff: @@ -3903,7 +3903,7 @@ bool FieldDef::Deserialize(Parser &parser, const reflection::Field *field) {
  if (IsInteger(value.type.base_type)) {
  value.constant = NumToString(field->default_integer());
  } else if (IsFloat(value.type.base_type)) {
  - value.constant = FloatToString(field->default_real(), 16);
  + value.constant = FloatToString(field->default_real(), 17);
  }
  presence = FieldDef::MakeFieldPresence(field->optional(), field->required());
  padding = field->padding();
  