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Support variants with Option fields #2

Description

@juancampa

Some variants can have a common field wrapped in an Option.

So, for example:

enum MyEnum {
  A { name: String },
  B,
  C { name: Option<String> },
}

I expect .name() to work and return an Option<String>. However, we get an error because not all variants have the same type for the name field.

Instead, it would be nice to detect this case and append a .flatten() to the accessor.

Super useful crate. I'm surprised it isn't more popular

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