Thought I had an idea about this, I was wrong:
```julia
julia> @everywhere using PyCall
julia> @everywhere @pyimport pylab
julia> remotecall_fetch(pylab.cumsum, 5, collect(1:10))
ERROR: cannot serialize a pointer
[inlined code] from error.jl:21
in serialize at serialize.jl:420
[inlined code] from dict.jl:372
in serialize at serialize.jl:428
in serialize at serialize.jl:310
in serialize at serialize.jl:420 (repeats 2 times)
in serialize at serialize.jl:302
in serialize at serialize.jl:420
[inlined code] from dict.jl:372
in serialize at serialize.jl:428
in serialize at serialize.jl:310
in serialize at serialize.jl:420 (repeats 2 times)
in serialize at serialize.jl:302
in serialize at serialize.jl:420
[inlined code] from dict.jl:372
in send_msg_ at multi.jl:222
[inlined code] from multi.jl:177
in remotecall_fetch at multi.jl:728
[inlined code] from multi.jl:368
in remotecall_fetch at multi.jl:734
julia> pylab.cumsum(collect(1:10))
10-element Array{Int64,1}:
1
3
6
10
15
21
28
36
45
55
```
