fix: don't use similar on prototype

Author: avik-pal

Project.toml

@@ -1,7 +1,7 @@
 name = "NonlinearSolve"
 uuid = "8913a72c-1f9b-4ce2-8d82-65094dcecaec"
 authors = ["SciML"]
-version = "3.15.0"
+version = "3.15.1"
 
 [deps]
 ADTypes = "47edcb42-4c32-4615-8424-f2b9edc5f35b"

src/internal/jacobian.jl

@@ -92,13 +92,13 @@ function JacobianCache(prob, alg, f::F, fu_, u, p; stats, autodiff = nothing,
                 end
             end
         else
-            jac_proto = if eltype(f.jac_prototype) <: Bool
-                similar(f.jac_prototype, promote_type(eltype(fu), eltype(u)))
+            if eltype(f.jac_prototype) <: Bool
+                jac_proto = similar(f.jac_prototype, promote_type(eltype(fu), eltype(u)))
+                fill!(jac_proto, false)
+                jac_proto
             else
-                similar(f.jac_prototype)
+                f.jac_prototype
             end
-            fill!(jac_proto, false)
-            jac_proto
         end
     end