[julia-users] How to have type parameters T less than DenseArray{AbstractFloat} in the covariant sense?

[cheng wang]

First sorry, my last post is wrong. And I wanted to delete it and repost, 
it did not work.
Sorry if it bothers you.

Here is my question:
In Julia, T <: DenseArray{AbstractFloat} does not mean T in 
(SharedArray{Float32}, SharedArray{Float64}, ...).
That is: I want to have all the array type less than DenseArray together 
with all Float types.
I try to use {F<:AbstractFloat, T<:Array{F}}, however Julia does not 
support this.

So, what's the Julia's way to achieve this?

Thanks,
Cheng