tests for heterogeneous tuples

test/sorting.jl

@@ -126,6 +126,12 @@ end
         end
         test_zero_allocated(ntuple(identity, max_unrolled_length))
     end
+    @testset "heterogeneous" begin
+        tup = (1, 2, 3, missing, missing)
+        for t ∈ (tup, (1, missing, 2, missing, 3), (missing, missing, 1, 2, 3))
+            @test tup === @inferred sort(t)
+        end
+    end
 end
 
 @testset "partialsort" begin