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Type classes / traits
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NASA's aging crawler is about to haul 18 million pounds on its back, again
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.
"But we talked for four hours and that night we wrote Back To Black and that changed my life forever."