Varying Params

Key Varying Params in Portfolio refers to an optional object of type KeySet that holds a set of Key-Value pairs(K₁,V₁), (K₂,V₂), ..., where the KeysK₁, K₂, ... are a subset of the input expected by the Create function of the Deriscope Type defined in the key Tradable Type
Furthermore, each ValuesVᵢ is an array containing R elements Vᵢ¹, Vᵢ², ..., Vᵢᴿ
The integer R must be the same of all the keys K₁, K₂, ...
The Create function will be invoked R times.
At each such invocation, it will be fed with an input consisting of the union of the fixed Key-Value pairs defined in the key Common Params and the pairs (K₁,V₁), (K₂,V₂), ...