HttpResponse uses json_decode($body, true); - changes data with empty objects

[MymmiJ]

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HttpResponse.php using json_decode($body, true); means that empty objects get translated to arrays, which breaks some of our stuff.

We've extended DocumentHandler in order to override the getDocument method, but I think a better solution might be to provide the ability to decide whether an item is decoded into associative arrays or objects, as this was not obvious default behaviour to us.