jsonread function in InterTypes recognizes the sum type not the variant type

[p-stokes]

Currently, the jsonread function in InterTypes recognizes the type as the sum type. Shouldn't it recognize it as the variant type?

For example, in the test case below, jsonread reads t as a Term not as a Plus.

@intertypes "simpleast.it" module simpleast end
using .simpleast
t = Plus([Constant(ConstInt(1)), Constant(ConstInt(2))])
s = jsonwrite(t)
@test s isa String
@test jsonread(s, Term) == t