Function both

src/main/java/fieldcef/plugins/Interventions.kt:204–206

inline infix fun <T> Box.down(next: Dict.Prop<T>): T? {
    return this.find(next, this.downwards()).findFirst().orElseGet { null }
}

inline infix fun <T> Box.both(next: Dict.Prop<T>): T? {
    return this.find(next, this.both()).findFirst().orElseGet { null }
}