Allow Proxy to implement Send
          #39
        
          
      
                
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Proxy uses
PhantomData<*const P>, which prevents it from implementingSend. I see that this was done intentionally forProxyin e863862 (while all the other types usefn() -> P), but I don't understand why.Is there a reason
Proxycannot safely implementSend, or some other reason*const Pis required?