Cannot pass empty array of initial conditions

[hersle]

For consistency, would it be possible to make M4 work like M3?

using ModelingToolkit
@independent_variables t
D = Differential(t)
@variables x(t)
@named M1 = System([D(x) ~ 0], t; initial_conditions = Dict(x => 0)) # works
@named M2 = System([D(x) ~ 0], t; initial_conditions = [x => 0]) # works
@named M3 = System([D(x) ~ 0], t; initial_conditions = Dict()) # works
@named M4 = System([D(x) ~ 0], t; initial_conditions = []) # fails

ERROR: MethodError: no method matching defsdict(::Vector{Any})
The function `defsdict` exists, but no method is defined for this combination of argument types.

Closest candidates are:
  defsdict(::ModelingToolkitBase.AtomicArrayDict{SymbolicUtils.BasicSymbolicImpl.var"typeof(BasicSymbolicImpl)"{SymReal}, Dict{SymbolicUtils.BasicSymbolicImpl.var"typeof(BasicSymbolicImpl)"{SymReal}, SymbolicUtils.BasicSymbolicImpl.var"typeof(BasicSymbolicImpl)"{SymReal}}})
   @ ModelingToolkitBase ~/.julia/packages/ModelingToolkitBase/lC2g8/src/systems/system.jl:379
  defsdict(::Union{AbstractDict, AbstractArray{<:Pair}})
   @ ModelingToolkitBase ~/.julia/packages/ModelingToolkitBase/lC2g8/src/systems/system.jl:380

I am programmatically generating initial_conditions. Sometimes it ends up as an empty array, and it would be nice to not have to treat that with a special case in my code. Similarly for bindings and other similar fields.

I know I can probably always use a Dict and be fine, but maybe it would be nice to support arrays in the same way?

[SebastianM-C]

Why not Pair[] instead of []? I think that should work

[hersle]

I think that works, yes. But I think it would be most friendly to let users always write [...] or Dict(...) without needing to take special care in the empty case.