Modeling Toolkit - parameters type conversion issue

Specific Domains Modelling & Simulations
1

I am trying to optimize my code and remove types Any. However, I am stuck with one within Modeling Toolkit. The code below shows the problem. When calling System function, sometimes I get parameters of type “Vector{Num}” and sometimes of type Vector{SymbolicUtils.BasicSymbolic{Real}}. I have tried a few versions and am unsure how to make it consistent, so the type doesn’t turn to Any after composing multiple systems together. Any suggestion would be greatly appreciated.

using ModelingToolkit
using ModelingToolkit: t_nounits as t, D_nounits as D

# individual node dynamics
n_params = 2
@parameters p[1:n_params]
@variables x₁(t) [output=true] x₂(t) I(t) [input=true]

eqs = [D(x₁) ~ x₂,
       D(x₂) ~ -(p[1] + p[2]) * x₂ - (p[1] * p[2]) * x₁ + I
    ]

node1 = System(eqs, t, [x₁, x₂, I], p; name=:Node1)
node2 = System(eqs, t, [x₁, x₂, I], p; name=:Node2)

# connection dynamics
n_nodes = 2
adjacency_matrix = zeros(n_nodes, n_nodes)
adjacency_matrix = [0 1; # only node 1 receives input from node 2
                    0 0] 

@parameters A[1:n_nodes,1:n_nodes]=adjacency_matrix σ=1.0
connection_eqs = [Equation(node1.I, A[1, 1] * node2.x₁ + σ), Equation(node2.I, 0.)]
combined_params = vcat(vec(A), σ)
input_output_vars = [node1.I, node2.x₁]
connectivity_sys = System(connection_eqs, t, input_output_vars, combined_params; name=:connection_sys);

# combine node and connection dynamics
combined_sys = structural_simplify(compose(connectivity_sys, [node1, node2]))

# print types of parameters
println("Type of parameters in node1: ", typeof(parameters(node1)))
println("Type of parameters in node2: ", typeof(parameters(node2)))
println("Type of parameters in combined_params (before connectivity_sys): ", typeof(combined_params))
println("Type of parameters in connectivity_sys: ", typeof(parameters(connectivity_sys)))
println("Type of parameters in combined_sys: ", typeof(parameters(combined_sys)))

The response is:

Type of parameters in node1: Vector{Num}
Type of parameters in node2: Vector{Num}
Type of parameters in combined_params (before connectivity_sys): Vector{Num}
Type of parameters in connectivity_sys: Vector{SymbolicUtils.BasicSymbolic{Real}}
Type of parameters in combined_sys: Vector{Any}

Thank you.