Fix type-stability of mass matrix

Author: ChrisRackauckas

src/ode_def_opts.jl

@@ -128,7 +128,7 @@ function ode_def_opts(name::Symbol,opts::Dict{Symbol,Bool},curmod,ex::Expr,param
   quote
     struct $name{F,TG,TJ,TW,TWt,S} <: ParameterizedFunctions.DiffEqBase.AbstractParameterizedFunction{true}
       f::F
-      mass_matrix::ParameterizedFunctions.LinearAlgebra.UniformScaling
+      mass_matrix::ParameterizedFunctions.LinearAlgebra.UniformScaling{Bool}
       analytic::Nothing
       tgrad::TG
       jac::TJ