fun <K, V> MapEntrySerializer(keySerializer: KSerializer<K>, valueSerializer: KSerializer<V>): KSerializer<Entry<K, V>>
Returns built-in serializer for Map.Entry.
Resulting serializer represents entry as a structure with a single key-value pair.
E.g. Pair(1, 2) and Map.Entry(1, 2) will be serialized to JSON as
{"first": 1, "second": 2} and {"1": 2} respectively.