即时信息的窗口有很多格式的选择。
The instant messaging window has quite a few formatting options.
而如果我们添加了对更多格式的支持，我们将需要面对每个controller中的大量代码。
But if we were to add another resource, that wouldn't be so DRY, and if we add in support for more formats, we'll end up with lots of code in each controller.
要提供此信息，需要为每个对象分配捕获分配堆栈跟踪，此开销很大，并且在许多格式的内存转储中不可用。
To provide that information, it is necessary to capture allocation stack traces for every object allocation, which is very expensive and is also not available in most formats of memory dumps.
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