Merge pull request #1090 from SciML/myb/u0

Always respect user provided `u0` override

Author: ChrisRackauckas

src/solve.jl

@@ -1176,7 +1176,8 @@ function get_concrete_problem(prob, isadapt; kwargs...)
     tspan_promote = promote_tspan(u0_promote, p, tspan, prob, kwargs)
     f_promote = promote_f(prob.f, Val(SciMLBase.specialization(prob.f)), u0_promote, p,
         tspan_promote[1])
-    if isconcreteu0(prob, tspan[1], kwargs) && typeof(u0_promote) === typeof(prob.u0) &&
+    if isconcreteu0(prob, tspan[1], kwargs) && prob.u0 === u0 &&
+       typeof(u0_promote) === typeof(prob.u0) &&
        prob.tspan == tspan && typeof(prob.tspan) === typeof(tspan_promote) &&
        p === prob.p && f_promote === prob.f
         return prob

test/downstream/prob_kwargs.jl

@@ -10,3 +10,7 @@ prob = ODEProblem(lorenz, u0, tspan, alg = Tsit5())
 @test_nowarn sol = solve(prob, reltol = 1e-6)
 sol = solve(prob, reltol = 1e-6)
 @test sol.alg isa Tsit5
+
+new_u0 = rand(3)
+sol = solve(prob, u0 = new_u0)
+@test sol.prob.u0 === new_u0