/Users/realm/workspace/realm_realm-core_release_6.0.6/src/realm/array.hpp:1136: [realm-core-6.0.6] Assertion failed: has_refs()
0   Realm                               0x000000010c955d6c _ZN5realm4utilL18terminate_internalERNSt3__118basic_stringstreamIcNS1_11char_traitsIcEENS1_9allocatorIcEEEE + 28
1   Realm                               0x000000010c956008 _ZN5realm4util9terminateEPKcS2_lOSt16initializer_listINS0_9PrintableEE + 324
2   Realm                               0x000000010c8740a4 _ZN5realm7Cluster4initENS_6MemRefE + 156
3   Realm                               0x000000010c873984 _ZNK5realm16ClusterNodeInner7try_getENS_6ObjKeyERNS_11ClusterNode5StateE + 204
4   Realm                               0x000000010c87cbec _ZNK5realm11ClusterTree8is_validENS_6ObjKeyE + 36
5   Realm                               0x000000010c8de60c _ZNK5realm8ConstObj8is_validEv + 100
6   Realm                               0x000000010c6793c8 ___ZN12_GLOBAL__N_115makeBoxedGetterIN5realm10StringDataEEEP11objc_objectm_block_invoke + 48
7   MyApp                           0x000000010172bcf8 $sSo21TRGC09transportbC2IdSSSgvpABTK + 64
8   MyApp                           0x000000010172bd90 $sSo21TRGC09transportbC2IdSSSgvpABTK + 216
9   libswiftCore.dylib                  0x00000001ba8195a0 01A8EE3D-C8DC-396B-89AD-A5F64DF13F80 + 955808
10  libswiftCore.dylib                  0x00000001ba81912c 01A8EE3D-C8DC-396B-89AD-A5F64DF13F80 + 954668
11  libswiftCore.dylib                  0x00000001ba818e48 01A8EE3D-C8DC-396B-89AD-A5F64DF13F80 + 953928
12  libswiftCore.dylib                  0x00000001ba81b824 swift_getAtKeyPath + 176
13  MyApp                           0x0000000101af5f1c $s6RMyApp13ObjectWrapperC2eeoiySbACyxq_G_AEtFZ + 284
14  MyApp                           0x0000000101af645c $s6MyApp13ObjectWrapperCyxq_GSQAASQ2eeoiySbx_xtFZTW + 24
15  libswiftCore.dylib                  0x00000001ba85f22c $sSh8_VariantV6removeyxSgxF + 428
16  MyApp                           0x0000000101728f28 $sSo27TRGC6RabbitE23enumerateExistingValues33_5102C99FD4F65A5C1106ABE8612FF5B8LL4from2in7keyPath5blockySayxG_AJs03KeyT0Cyxq_Gyx_xSitXEtSHR_r0_lFZ + 1824
17  MyApp                           0x000000010172bc80 $sSo27TRGC6MyApptE21enumerateExistingTRGs4from2in5blockySaySo0abC0CG_AJyAI_AISitXEtFZ + 320
18  MyApp                           0x000000010172bfb8 $sSo27TRGC6MyAppE21enumerateExistingTRGs4from2in5blockySaySo0abC0CG_AJyAI_AISitXEtFZTo + 21239  libdispatch.dylib                   0x000000010ce4de98 _dispatch_block_async_invoke2 + 104
40  libdispatch.dylib                   0x000000010ce3f730 _dispatch_client_callout + 16
41  libdispatch.dylib                   0x000000010ce42390 _dispatch_continuation_pop + 524
42  libdispatch.dylib                   0x000000010ce41810 _dispatch_async_redirect_invoke + 680
43  libdispatch.dylib                   0x000000010ce50d74 _dispatch_root_queue_drain + 376
44  libdispatch.dylib                   0x000000010ce51698 _dispatch_worker_thread2 + 152
45  libsystem_pthread.dylib             0x00000001acfd0b38 _pthread_wqthread + 212
46  libsystem_pthread.dylib             0x00000001acfd3740 start_wqthread + 8!!! IMPORTANT: Please send this log and info about Realm SDK version and other relevant reproduction info to help@realm.io.

/// The wrapper object that wrapps RLMobjects so they can be inserted into Sets and perform set operations like containsObject, union...
public class ObjectWrapper<T,U>: Hashable, Equatable where U: Hashable & Equatable {
    public let wrappedObject: T
    private let primaryKeyPath: KeyPath<T, U>
    public init(with object: T, primaryKeyPath: KeyPath<T, U>) {
        self.wrappedObject = object
        self.primaryKeyPath = primaryKeyPath
    }
    
    public static func == (lhs: ObjectWrapper<T, U>, rhs: ObjectWrapper<T, U>) -> Bool {
        return lhs.wrappedObject[keyPath: lhs.primaryKeyPath] == rhs.wrappedObject[keyPath: lhs.primaryKeyPath]
    }
    
    public func hash(into hasher: inout Hasher) {
        hasher.combine(wrappedObject[keyPath: primaryKeyPath])
    }
}

/// A method to enumerate existing values from one Array in the other Array
private static func enumerateExistingValues<T, U:Hashable & Equatable>(from lhs:Array<T>, in rhs:Array<T>, keyPath: KeyPath<T, U>, block: (T, T, Int) -> Void) {
        var leftSet: Set<ObjectWrapper<T, U>> = []
        var rightSet:Set<ObjectWrapper<T, U>> = []
        for value in lhs {
            leftSet.insert(ObjectWrapper<T, U>(with: value, primaryKeyPath: keyPath))
        }
        for value in rhs {
            rightSet.insert(ObjectWrapper<T, U>(with: value, primaryKeyPath: keyPath))
        }
        
        for (index, leftValue) in leftSet.enumerated() {
            if let rightValue = rightSet.remove(leftValue) {
                block(leftValue.wrappedObject, rightValue.wrappedObject, index)
            }
        }
    }

    public static func == (lhs: ObjectWrapper<T, U>, rhs: ObjectWrapper<T, U>) -> Bool {
        return lhs.wrappedObject[keyPath: lhs.primaryKeyPath] == rhs.wrappedObject[keyPath: lhs.primaryKeyPath]
    }