I have a (Java-Library-) Class `JsonSerde<T>...

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I have a (Java-Library-) Class JsonSerde<T> with a constructor JsonSerde(Class<T> clazz, ObjectMapper mapper).
How do I create an instance JsonSerde<MutableMap<String, Any>>?
I tried JsonSerde(MutableMap::class.java, objectMapper), but I get a Expected type mismatch … found JsonSerde<MutableMap<*, *>>
I also tried JsonSerde(MutableMap<String, Any>::class.java, objectMapper), but then I get Only classes are allowed on the left hand side of a class literal.
Is an explicit cast (ugly and verbose) really the only way?