Merge branch 'handle_units' of github.com:SciML/Catalyst.jl into handle_units

Author: TorkelE

test/miscellaneous_tests/symbolic_stoichiometry.jl

@@ -218,7 +218,7 @@ let
     end
 
     u0 = [:X => 8, :Y => 8]
-    ps_int = [:p => 1.0, :n1 => 3, :n2 => 4, :d => 0.1]
+    ps_int = (:p => 1.0, :n1 => 3, :n2 => 4, :d => 0.1)
     ps_dec = [:p => 1.0, :n1 => 0.5, :n2 => 2.5, :d => 0.1]
     tspan = (0.0, 10.0)