Not sure why an enum with 12 cases is a bad idea. And each case can have an associated value.
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Depends on how much is shared between types. You could have switches in just one private dispatch() method.
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In many cases the alternative would be "a bunch of type decls with method implementations" too.
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Switching an enum groups code by operation; implementing a protocol groups code by type.
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enums seem a bit neglected with the focus on protocol oriented code. All hail the enum!