Not sure if this helps, but here an example:
The Complex type (at the Standard Math/complex pure library) used to be a
tuple, and was upgraded to a generic object. There are two possible
representations of a complex number: rectangular and polar. The library and
most functions are based on the
I'd just use a tuple or object for that.
When I started with Nim years ago I used arrays, as tuples are only necessary
when not all types are identical, and as we can iterate at runtime over array,
which may be rarely needed for a proc result. Then I saw examples using tuples,
and I think that time automatic tuple unpacking was working
