Redirects for assemblies in the GAC are removed by paket #1574

Description

I have a solution which needs this redirect:

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>

Which is being removed by paket.

System.Web.Extensions is in the GAC.
I would expect paket to leave along any redirects for GAC registered assemblies by default or at least provide a configuration option where we can specify the redirects we want to keep