Default value for a fixture?

Hello everyone,

I’m currently using fixtures to define some product attributes that I need for my shop.
I have a question about it : how do you define a default value for a select ?

                                name: Prix modifiable
                                code: editable_price
                                type: select
                                        - fr_FR: "Oui"
                                        - fr_FR: "Non" # I'd like this one to be the default for example

I have the same question for an integer type. Is there a way to set a default value ? Thanks a lot in advance.