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Gson Codec
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===================
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This module adds support for encoding and decoding JSON via the Gson library.
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Add `GsonEncoder` and/or `GsonDecoder` to your `Feign.Builder` like so:
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```java
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GitHub github = Feign.builder()
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.encoder(new GsonEncoder())
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.decoder(new GsonDecoder())
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.target(GitHub.class, "https://api.github.com");
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```
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### Map<String, Object> and Numbers
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The default constructors of `GsonEncoder` and `GsonDecoder` decoder numbers in
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`Map<String, Object>` as Integer type. This prevents reading `{"counter", "1"}`
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as `Map.of("counter", 1.0)`.
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To change this, please use constructors that accept a Gson object.
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