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r:` returns nil.
// In that case, our weak target has been reclaimed. Return a dummy method signature to keep `doesNotRecognizeSelector:` from firing.
// We'll emulate the Obj-c messaging nil behavior by setting the return value to nil in `forwardInvocation:`, but we'll assume that the return value is `sizeof(void *)`.
// Other libraries handle this situation by making use of a global method signature cache, but that seems heavier than necessary and has issues as well.
// See https://www.mikeash.com/pyblog/friday-qa-2010-02-26-futures.html and https://github.com/steipete/PSTDelegateProxy/issues/1 for examples of using a method signature cache.
return [NSObject instanceMethodSignatureForSelector:@selector(init)];
}
@end
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