In my app, sometimes a file containing a defmethod hasn't been
required yet by the time some other function calls the multi-method.
So naturally it throws an exception.

But later, as the app continues to run, the file containing the proper
defmethod eventually gets required by another file. Then everything
works fine.

The ugly solution is to require all possible implementations of a
multi-method in the file that calls it. But that feels like it defeats
the goal of polymorphism, to not have to know about concrete
implementors of an interface.

Is there a better solution to this kind of race condition?

-Steven

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