fix: fix promote_operation_fallback for AddSubMul with UniformScaling

Author: AayushSabharwal

src/interface.jl

@@ -57,6 +57,23 @@ function promote_operation_fallback(
     return promote_operation(new_op, T, z)
 end
 
+function promote_operation_fallback(
+    op::AddSubMul,
+    ::Type{S},
+    ::Type{LinearAlgebra.UniformScaling{T}},
+) where {S, T}
+    promote_operation(op, S, T)
+end
+
+# avoids ambiguity of the method above this with the one below it
+function promote_operation_fallback(
+    op::AddSubMul,
+    ::Type{S},
+    ::Type{LinearAlgebra.UniformScaling{T}},
+) where {S <: AbstractArray, T}
+    promote_operation(op, S, Matrix{T})
+end
+
 function promote_operation_fallback(
     op::AddSubMul,
     x::Type{<:AbstractArray},