Type Definition gorrosion_gtp::gtp_type::Collection

pub type Collection = Value;

A heterogenous tuple.

The spec says

[A pair (x, y) where] x and y may be any combination of simple entities. The construction can be generalized to any fixed number of entities.

I was not able to determine whether tuples of length 0 and 1 are allowed so we do the simpler thing and include them in our abstraction.