97528b59cf
This enables formats like JSON to serialize newtype wrapper
structs without the normal object wrapper. Consider types like:
```rust
struct Point {
x: u32,
y: u32,
}
stuct MyPoint(Point);
```
Before this patch, `MyPoint(1,2)` would get serialized as
`[{"x":1,"y":2}]`, but now it gets serialized as `{"x":1,"y"2}`.
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|---|---|---|
| .. | ||
| test_annotations.rs | ||
| test_bytes.rs | ||
| test_de.rs | ||
| test_json_builder.rs | ||
| test_json.rs | ||
| test_macros.rs | ||
| test_ser.rs | ||
| test.rs | ||
| test.rs.in | ||