Internally tagged tuple and newtype variants

[axos88]

What is the exact issues on supporting internally tagged enums for all cases (newtypes of all types (ha!), tuple variants, etc)

I would guess in case of the tuple variants in the default case the challenge is where to put the data.

I would propose two solutions:

• fall back to adjacent tagging in cases that are not supported by internal tagging (the easier solution)
• allow the user to "name" the tuple members, like so:

#[derive(Serialize, Deserialize)]
#[serde(tag = variant )]
enum Foo {
  Tuple( #[serde(key = bar)] Bar, #[serde(key = baz)] Baz),
  Newtype( #[serde(key = value )] u32)
}

This would serialize to yaml like so:

data:
  - variant: Tuple
    bar: ....
    baz: .....
  - variant: Newtype
    value: 42

The latter would basically allow newtype/struct variants to be serialized/ deserialuzes as struct variants.

[axos88]

Perhaps use the already existing rename directive