Fix internally tagged enum deserialization with unknown fields #1376
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Currently an internally tagged enum with a unit variant will fail to deserialize if the map contains unknown fields.
Example on Playground
This change attempts to address that by having the
InternallyTaggedUnitVisitor.visit_mapmethod consume the map before returning.I've added a test case for the simple enum case and for the case where the unit enum variant is flattened into a struct.