Haskell, MicroHs, Ben Lynn (later stages), Tao
conjoined argument to a long option that's not consumed by the handler。关于这个话题，PDF资料提供了深入分析
As was already mentioned several times, a module should be easily replaceable. Even if there are several other modules dependent on it, having a clear, public API enables us to replace the module by a new implementation. There are also some other considerations, e.g. related to bootstrapping of the module, but the clear API is by far the most important one.，这一点在PDF资料中也有详细论述
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