Support deserializing a flattened internally tagged enum #1245
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The fact that the tag entry is consumed was only observable if there is
a later flattened map field, at which point the behavior is already
confusing anyway.
#[derive(Deserialize)]
struct Example {
#[serde(flatten)]
a: InternallyTagged,
#[serde(flatten)]
rest: BTreeMap<String, Value>,
}
Before this simplification the map would receive all the fields of the
internally tagged enum but not its tag, after it receives all the fields
including the tag.
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Fixes #1189.