Abstract Type `Parameters`?

[benedict-96]

Should we create an abstract type Parameters from which NullParameters and NeuralNetworkParameters are subtyped?

[michakraus]

I guess not as this might cause problems without providing too much general value. An abstract super type for parameters like this doesn't provide much context that would be useful for dispatch. Most often, parameters are NamedTuple or NullParameters, which do not have a common super type. One would probably not like to wrap NamedTuple to provide the context of it being a parameter. On the other hand, NeuralNetworkParameters are very specific and I guess there are not that many instances in which you want to dispatch on something like a general AbstractParamter.

We do have type unions, though, which are useful for dispatch:

const OptionalParameters    = Union{NamedTuple, NullParameters}