Add a simple test for this specific issue, and a fix to unwrap_broadcasted.

Author: rofinn

src/broadcast.jl

@@ -42,7 +42,7 @@ end
 
 function unwrap_broadcasted(bc::Broadcasted{KeyedStyle{S}}) where {S}
     inner_args = map(unwrap_broadcasted, bc.args)
-    Broadcasted{S}(bc.f, inner_args)
+    Broadcasted{S}(bc.f, inner_args, axes(bc))
 end
 unwrap_broadcasted(x) = x
 unwrap_broadcasted(x::KeyedArray) = parent(x)

test/_basic.jl

@@ -259,6 +259,17 @@ end
         @test_throws Exception unify_keys((1:2,), ([3,4],))
 
     end
+    @testset "https://github.com/mcabbott/AxisKeys.jl/issues/128" begin
+        using LinearAlgebra
+
+        # Really simple test that broadcasting with linalg array types works.
+        v = rand(10)
+        σ = wrapdims(v; time=-4:5)
+        L = LowerTriangular(reshape(1.0:1.0:100, (10, 10)))
+        σ .* L
+        v .* L
+        @test σ .* L ≈ v .* L
+    end
 end
 @testset "bitarray" begin