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Add support for schema example in OAS3 parameters

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According to OAS3 Specification, an example element can be included in a schema object. https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#schemaObject I fixed to use example value under the schema object under the parameter object when...

@request.filtered_env may includes both String and Symbol. Then exception raised and mail didn't sended. So, I map all of item to String. I don't know when this problem happens. sorry.