message: Propagate boolean default values from proto to fbs
diff: @@ -2608,10 +2608,13 @@ CheckedError Parser::ParseProtoFields(StructDef *struct_def, bool isextend,
  auto val = attribute_;
  ECHECK(ParseProtoCurliesOrIdent());
  if (key == "default") {
  - // Temp: skip non-numeric defaults (enums).
  + // Temp: skip non-numeric and non-boolean defaults (enums).
  auto numeric = strpbrk(val.c_str(), "0123456789-+.");
  - if (IsScalar(type.base_type) && numeric == val.c_str())
  + if (IsScalar(type.base_type) && numeric == val.c_str()) {
  field->value.constant = val;
  + } else if (val == "true") {
  + field->value.constant = val;
  + } // "false" is default, no need to handle explicitly.
  } else if (key == "deprecated") {
  field->deprecated = val == "true";
  }
  