`cast` broken?

[sls1005]

It seems that if you import a C type as `object`, and cast a variable of that 
type into another, will get some strange result.
    
    
    type X {.importc: "int".} = object
    {.emit: "int a = 10;".}
    var a {.importc, nodecl.}: X
    assert cast[ptr int](addr a)[] == 10 #suceeded
    assert cast[int](a) == 10 #failed
    # This does not happen if you change `object` into `cint`
    
    
    Run

Is it a bug?