Should MarshalChan take an interface{} instead of a chan interface{}

[alex]

Right now MarshalChan takes a chan interface{}. However this means that if you have a typed-chan you need to copy all the elements to a new in order to pass them to this function.

If MarshalChan took an interface{} (the way UnmarshalToChan does), then we could avoid this problem.

[kishaningithub]

@alex Instead of converting between channel types i find it very simple and idiomatic to do this

csvWriter := make(chan interface{}, 1000)
go func() {
    _ = gocsv.MarshalChan(csvWriter, gocsv.DefaultCSVWriter(out))
}()   
// several bussiness logic
csvWriter <-  CsvStruct{name: "name", age: 90}