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v0.5.3

v0.5.3: Merge #30
@bors bors tagged this 14 Aug 10:53 
30: Support deserializing a (keyword) string into a unit-only enum r=nox a=smangelsdorf

This adds support for deserializing a structure such as:

```rust
#[derive(Serialize, Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
enum SortOrder {
    Asc,
    Desc,
}

#[derive(Serialize, Deserialize, Debug)]
struct SearchOptions {
    sort: SortOrder,
}
```

This is already supported for serialization (and I've added a test case for the existing support as part of this PR), but attempting to deserialize the string `"sort=asc"` would result in the error:

```
invalid type: string "asc", expected enum SortOrder
```

I've made a sample in the playground of the way this is handled in `serde_urlencoded` vs `serde_json`: https://play.rust-lang.org/?gist=75fc1e5bbbc1eec29a472373d47488a0&version=stable

This brings the behaviour in line with the way `serde_json` currently handles this case, which I hope is appropriate. Happy to tweak the behaviour if there's a better way to handle it.

Co-authored-by: Shaun Mangelsdorf <s.mangelsdorf@gmail.com>
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