Fix patch_pre_transformed_spec when object is replaced by an array #398
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In the patch pre-transformed spec logic, when a JSON object is replaced by an array, it could sometimes happen that the result would be an object with integer keys (e.g.
{"0": "A", "1": "BB"}instead of an array (e.g.["A", "BB"]). I think this is a natural consequence of how JSON patching works, so I don't think it's necessarily a bug in json-patch.This PR identifies such objects and converts them to proper arrays.