backport deprecation fix

Author: ChrisRackauckas

Project.toml

@@ -1,7 +1,7 @@
 name = "LinearSolve"
 uuid = "7ed4a6bd-45f5-4d41-b270-4a48e9bafcae"
 authors = ["SciML"]
-version = "2.39.0"
+version = "2.39.1"
 
 [deps]
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"

src/default.jl

@@ -45,7 +45,7 @@ end
 # For SciML algorithms already using `defaultalg`, all assume square matrix.
 defaultalg(A, b) = defaultalg(A, b, OperatorAssumptions(true))
 
-function defaultalg(A::Union{DiffEqArrayOperator, MatrixOperator}, b,
+function defaultalg(A::MatrixOperator, b,
         assump::OperatorAssumptions{Bool})
     defaultalg(A.A, b, assump)
 end

src/deprecated.jl

@@ -83,3 +83,10 @@ end
     cache::LinearCache,
     args...;
     kwargs...) false
+
+@static if isdefined(SciMLBase, :DiffEqArrayOperator)
+    function defaultalg(A::DiffEqArrayOperator, b,
+            assump::OperatorAssumptions{Bool})
+        defaultalg(A.A, b, assump)
+    end
+end