refactor: implement new additions to SII interface

Author: AayushSabharwal

Project.toml

@@ -102,7 +102,7 @@ SimpleNonlinearSolve = "0.1.0, 1"
 SparseArrays = "1"
 SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 2"
 StaticArrays = "0.10, 0.11, 0.12, 1.0"
-SymbolicIndexingInterface = "0.3.1"
+SymbolicIndexingInterface = "0.3.11"
 SymbolicUtils = "1.0"
 Symbolics = "5.24"
 URIs = "1"

src/systems/abstractsystem.jl

@@ -495,6 +495,8 @@ function SymbolicIndexingInterface.is_observed(sys::AbstractSystem, sym)
            !is_independent_variable(sys, sym) && symbolic_type(sym) != NotSymbolic()
 end
 
+SymbolicIndexingInterface.default_values(sys::AbstractSystem) = get_defaults(sys)
+
 SymbolicIndexingInterface.is_time_dependent(::AbstractTimeDependentSystem) = true
 SymbolicIndexingInterface.is_time_dependent(::AbstractTimeIndependentSystem) = false