data - Export dataset to JSON including Unicode Characters

I'm experiencing a weird issue. Consider a dataset defined like this:

dataset = Dataset[{<|"a" -> 1, "b" -> 2|>, <|"a" -> 3, "b" -> 4|>}];

Now I would expect Export["test.json", dataset] to create a JSON file with these contents:

[{"a": 1, "b": 2}, {"a": 3, "b": 4}].

Instead, the command returns

Export::badval: The element Data contains invalid values. >>.

A workaround is to run

Export["test.json", Normal[Normal[dataset]]] 

but that seems merely a workaround. Is there anyone here who knows a neat solution?