interface Setter<D, E, R> : Setter<R>, (D, E, R) -> Unit
Setter of the property is a set method declared alongside the property.
Can be used as a function that takes an argument of type D (the first receiver), an argument of type E (the second receiver), and the new property value and returns Unit.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-mutable-property2/-setter.html