Overriding enum values doesn't work

[xldenis]

Consider the following enum:

#[derive(Deserialize)]
pub enum Config {
    Case1 {
        field: bool,
    },
    Case2 {
        field: String,
    },
}

It becomes impossible to override the value of Config in through overlaid sources leading to "value of enum Config should be represented by either string or table with exactly one key". I would like to be able to provide a default value for this configuration but have a later, more specific bit of config override this. Is this a change which would be acceptable?