fix bug in JlIO.fileno() from change of return type of fd()

Author: Christopher Doris

src/JlWrap/io.jl

@@ -10,7 +10,7 @@ pyjlio_closed(io::IO) = Py(!isopen(io))
 pyjl_handle_error_type(::typeof(pyjlio_closed), io, exc) =
     exc isa MethodError && exc.f === isopen ? pybuiltins.ValueError : PyNULL
 
-pyjlio_fileno(io::IO) = Py(fd(io))
+pyjlio_fileno(io::IO) = Py(Base.cconvert(Cint, fd(io))::Cint)
 pyjl_handle_error_type(::typeof(pyjlio_fileno), io, exc) =
     exc isa MethodError && exc.f === fd ? pybuiltins.ValueError : PyNULL
 

test/JlWrap.jl

@@ -718,7 +718,7 @@ end
             y = pytextio(x)
             z = y.fileno()
             @test pyisinstance(z, pybuiltins.int)
-            @test pyeq(Bool, z, fd(x))
+            @test z == Base.cconvert(Cint, fd(x))
         end
     end
     @testset "flush" begin