From f05b38b97e73c20aba58a1e9286a6eca52608895 Mon Sep 17 00:00:00 2001
From: Christopher Rackauckas <accounts@chrisrackauckas.com>
Date: Sun, 22 Dec 2024 11:45:55 -0100
Subject: [PATCH] Fix AutoFiniteDiff caching

Adds the third cache to be truly non-allocating
---
 src/differentiation/jaches_products.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/differentiation/jaches_products.jl b/src/differentiation/jaches_products.jl
index 04c00917..aa589565 100644
--- a/src/differentiation/jaches_products.jl
+++ b/src/differentiation/jaches_products.jl
@@ -268,8 +268,9 @@ function JacVec(f, u::AbstractArray, p = nothing, t = nothing; fu = nothing,
     cache, vecprod, vecprod! = if autodiff isa AutoFiniteDiff
         cache1 = similar(fu)
         cache2 = similar(u)
+        cache3 = similar(u)
 
-        (cache1, cache2), num_jacvec, num_jacvec!
+        (cache1, cache2, cache3), num_jacvec, num_jacvec!
     elseif autodiff isa AutoForwardDiff
         cache1 = Dual{
             typeof(ForwardDiff.Tag(tag, eltype(u))), eltype(u), 1