RavenDb - Cannot Store Due to Duplicate Property Name

I'm trying to store a document in Raven - but a subclass hides a property on a base class - same name but different type. When I try and save it, I get this error:

"A member with the开发者_开发知识库 name 'User' already exists on 'Account'. Use the JsonPropertyAttribute to specify another name

However, the class is sealed and I don't own it or cannot extend it. Do I have any options at all?

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If you can modify the class that you are trying to store, you can set the JsonContract (on the DocumentConventions) and modify how it gets serialized from there.