<How to prohibit accepting values other than true ...

# stackoverflow

[user]

How to prohibit accepting values other than true and false in request for Kotlin Spring Boot
what decorator can I put on the class field so that values other than true and false are not accepted in the request.
now any values can go into the request, including boolean.
I can send false, 0 and an empty string - it will be interpreted as false.
I can send true, all positive and negative numbers and it will be interpreted as true.
what can I do to accept only true and false?
open class KdInfo : Info {

@Min(0)
var brutto: Long = 0

@NotNull
var isRefund: Boolean = false...