我有点困惑，无法找到有关此案例的正确信息。众所周知，从文档：
使用此功能可以停止程序，而不会影响预期的控制流程无法实现的运输代码性能接听电话-例如，在默认情况下，您在知道必须满足其他情况之一。至保护代码以防止版本内部版本的无效使用，请参阅preconditionFailure（_：file：line：）。
但是，当我的Crashlytics触发时，我在asserionFailure中收到崩溃报告。
Crashed: com.apple.main-thread
0 libswiftCore.dylib 0x1b0c15efc specialized _assertionFailure(_:_:file:line:flags:) + 440
1 libswiftCore.dylib 0x1b0a316b8 assertionFailure(_:file:line:) + 96
2 OneFit 0x100a3d238 AdditionalUserInfoRouter.enqueueRoute(with:animated:completion:) + 64 (AdditionalUserInfoRouter.swift:64)
3 OneFit 0x100a53040 protocol witness for MVVMRouter.enqueueRoute(with:animated:completion:) in conformance AdditionalUserInfoRouter + 4374458432 (<compiler-generated>:4374458432)
4 OneFit 0x100638224 MVVMRouter.enqueueRoute(with:) + 32 (MVVMRouter.swift:32)
5 OneFit 0x100a6a6c8 closure #2 in AdditionalUserInfoViewModel.close() + 132 (AdditionalUserInfoViewModel.swift:132)
6 OneFit 0x100a676a0 thunk for @escaping @callee_guaranteed (@guaranteed [Subscription]) -> (@error @owned Error) + 4374541984 (<compiler-generated>:4374541984)
7 OneFit 0x100a6fb94 partial apply for thunk for @escaping @callee_guaranteed (@guaranteed [Subscription]) -> (@error @owned Error) + 4374576020 (<compiler-generated>:4374576020)
8 PromiseKit 0x10344d048 $s10PromiseKit8ThenablePAAE4done2on5flags_AA0A0CyytGSo17OS_dispatch_queueCSg_8Dispatch0J13WorkItemFlagsVSgy1TQzKctFyAA6ResultOyARGcfU_yycfU_ + 64
9 PromiseKit 0x103426614 $sIeg_IeyB_TR + 28
10 libdispatch.dylib 0x1a35a9610 _dispatch_call_block_and_release + 24
11 libdispatch.dylib 0x1a35aa184 _dispatch_client_callout + 16
12 libdispatch.dylib 0x1a355c1d0 _dispatch_main_queue_callback_4CF$VARIANT$mp + 1044
13 CoreFoundation 0x1a385a3c4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
14 CoreFoundation 0x1a38553b8 __CFRunLoopRun + 2004
15 CoreFoundation 0x1a38548bc CFRunLoopRunSpecific + 464
16 GraphicsServices 0x1ad6c0328 GSEventRunModal + 104
17 UIKitCore 0x1a78ea6d4 UIApplicationMain + 1936
18 OneFit 0x1003b3784 main + 39 (AppDelegate.swift:39)
19 libdyld.dylib 0x1a36df460 start + 4
Crashlytics日志是否断言为崩溃，或者我有真正的崩溃？
不应在具有release优化级别的-O构建中启用断言。仔细检查您的目标，如果您是从头创建的或是从调试复制的，则可能已启用断言。
来自docs：
在操场上和-Onone构建（Xcode的Debug的默认设置配置），然后在可调试状态下停止程序执行打印消息。
在-O版本中，无效。
在-Ounchecked构建中，优化器可能会假定此函数为从来没有打电话。无法满足该假设是严重的编程错误。