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2058ae30ab
Correctly detects calls to `register()` with a function of incompatible return type. Correctly recognizes the `register()`, `dispatch()`, and `_clear_cache()` methods on a generic function, as well as the `registry` mapping. Possible future improvements: it would be amazing if `register()` checked if the first argument of the registered callable is indeed of valid type. This would require Callable[] to support varargs. It would also be great if we could read the arguments of the remaining arguments during `@singledispatch()` and cross-check them during `register()` with the currently registered implementation. Again, this would require Callable[] to become much more advanced.