Closed Feature: WebAPI AttributeRouting RoutePrefix issue [1370]

Hi,

as I can see you have defined the IHttpRouteInfoProvider contract that is implemented inside the RouteAttribute (which is sealed) and this allows us to build our own route attributes, is there a chance that you do the same for RoutePrefix ? There are few scenarios where we can take advantage of that approach and right now it's not possible.

Thanks
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