ReflectiveAccess.kt

internal fun <S : Any> Any.accessField(fieldName: String): S? =
    javaClass.getDeclaredField(fieldName).let { field ->
        field.isAccessible = true
        return@let field.get(this) as S
    }

internal fun Any.writeField(fieldName: String, value: Any) =
    javaClass.getDeclaredField(fieldName).let { field ->
        field.isAccessible = true
        field.set(this, value)
    }