Is there a defined minimal interface for a type to work with SparseArrays?

[abraunst]

@suavesito

using Symbolics
using SparseArrays

@variables a

v = sparsevec([1], [v])

v+v # here throws an error

Now issue #42730

[jlapeyre]

Your example has a typo.

[abraunst]

Not my example, but I had fixed in https://github.com/JuliaLang/julia/issues/42730