Thanks, that is what I suspected. 

On Thursday, April 2, 2015 at 4:13:31 PM UTC-4, Mauro wrote:
>
> Types in Julia are invariant: 
>
> If T1<:T2 is true 
> then A1{T1}<:A1{T2} is false (unless T1==T2). 
>
> Now setting T1=Float64 and T2=Union( Int64, Float64) means 
> Vector{Float64}<:Vector{Union( Int64, Float64)} is false.  Thus the no 
> method error. 
>
> On Thu, 2015-04-02 at 21:32, Michael Francis <mdcfr...@gmail.com 
> <javascript:>> wrote: 
> > Is the following expected behavior for union types, I'm assuming yes ? 
> > 
> > v = Union( Int64,Float64 )[] 
> > push!( v, 1.2) 
> > push!( v, 1)   # works 
> > 
> > f( v::Union(Int64,Float64)...) = v 
> > f( [ 1.2 ]...) # Works 
> > 
> > f( v::Vector{Union( Int64, Float64)}) = v 
> > f( [ 1.2 ])    # 'f' has not method matching f(::Array{Float64,1}) 
> > 
> > At first glance I'd expect the last case to work as well. 
>
>

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