more general similar

Author: xuanzhaogao

src/abstractblocksparsearray/arraylayouts.jl

@@ -67,7 +67,9 @@ function Base.similar(
         elt::Type,
         axes::Tuple{<:AbstractUnitRange},
     )
-    return Vector{elt}(undef, length(only(axes)))
+    # Convert blocked axes to plain axes to avoid creating BlockedVector
+    plain_axes = map(ax -> Base.OneTo(length(ax)), axes)
+    return similar(mul.B, elt, plain_axes)
 end
 
 # Materialize a SubArray view.

test/test_basics.jl

@@ -434,7 +434,7 @@ arrayts = (Array, JLArray)
 
         c = a * v
         @test Array(c) ≈ Array(a) * Array(v)
-        @test c isa Vector{elt}  # Result should be a plain Vector
+        @test c isa typeof(v)  # Result should match input vector type
         @test length(c) == size(a, 1)
 
         # Test with adjoint/transpose