Changelog

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type Animal struct {
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  Type string
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  Cat  *Cat
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  Dog  *Dog
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}
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func do() {
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  union := &Animal{
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    Cat: &Cat{
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      Name: "Fluffy",
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    },
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  }
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} ```
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If the user sets _both_ `Cat` and `Dog`, the user will receive an error when the type is serialized to JSON (i.e. in the `json.Marshaler` implementation).
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## 0.34.0
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**`(feat):`** Add support for sending the `User-Agent` header on every request. Go packages are uniquely identified by their full module path, so the `User-Agent` header is generated in the `<module>/<version>` format, e.g.
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``` User-Agent: github.com/acme/acme-go/1.0.0 ```