QtProtobuf: lowercased enum values are not renamed in default assignment

syntax = "proto2";
enum Format {
    lowercase = 0;
    UPPERCASE = 1;
    camelCase = 2;
    PascalCase = 3;
    snake_case = 4;
}

message FormattedMsg {
    required Format format = 1 [default = lowercase];
}

enum Format {
    Lowercase = 0,
    UPPERCASE = 1,
    CamelCase = 2,
    PascalCase = 3,
    Snake_case = 4,
}; 

class FormattedMsg_QtProtobufData : public QSharedData
{ 
public:
  FormattedMsg_QtProtobufData()
    : QSharedData(), 
      m_state(::FormatGadget::Format::lowercase) {}
...