Hi Tim,

thanks again for your detailed reply, I understood what was going wrong 
now. 
And another thank you for fixing the issue, after doing the Pkg.checkout 
the optimization now works with integers as well.
However, I still can't get a result because I'm still getting the error 
alluded to above:

> optimize(f, 0, 2)
`isless` has no method matching isless(::Array{Float64,1}, ::Array{Float64,1})
while loading In[15], in expression starting on line 1

 in <= at operators.jl:34

If I understand correctly, this means that two arrays are being passed to the 
isless function, which doesn't support arrays. 
I figured out that isless is contained in operators.jl, which in itself is part 
of the julia base, so it's probably not a bug 
in the function here. How can I figure out where the arrays being passed to 
isless are created? 
Sorry for bombarding you with questions here, but my debugging skills in julia 
are pretty much non-existant and I have to get used
to the logic of the julia error messages! 


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