Should Generators finally be given eltype

[ndinsmore]

@yuyichao & @nalimilan thank you for your explanations both of which make sense to me… I think.
That said with the limitation/flexibility of the current system could you help me understand how to solve the problem that drove me to ask this:

How can you dispatch on Iterator eltype including generators?

Ho can you dispatch on Iterator eltype including generators? I ask in an attempt to fix the following interface problem. Right now I am working on the get function of an interface that has many different types to dispatch, and potentially a lot of over head for each get initially. Something like: struct InterfaceIndirect index::Int64 end struct ApplicationIndirect ref::InterfaceIndirect end function interface_get(indirect::InterfaceIndirect) #lots of prework which makes it imprac…