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As far as I can tell: I've declared the @union type, I've got handlers for both variants of the request, and I've got my `UnionRule` declarations in place. What did I miss?

It's known by the UnionMembership as well
```23:49:30.57 [INFO] stdout: "FrozenOrderedSet([&lt;class 'pants_backend_k8s.util.kubeconfig.FileKubeconfigRequest'&gt;, &lt;class 'pants_backend_k8s.util.kubeconfig.HostKubeconfigRequest'&gt;])"```

Interestingly, if I hardcode the *other* variant it still fails, and if I hardcode *both* with isinstance it also fails. :exploding_head:

if you hardcode the callsite to `Get(KubeconfigResponse, OtherKubeconfigRequest)` and it fails, it sounds like it's a problem with that rule. a couple low-confidence suggestions from silly things I've done today:
• are you gathering the rule that provides that
• are you registering that in the register.py
• is the arg for that rule typed with the subclass and not the Union parent


Thanks! Yeah, much dumber issue. I was doing a `Get` for targets, but accidentally used `Get(Targets, Dependencies` instead of `Get(Targets, DependenciesRequest`... :disappointed: Fun thing is, that was in other rule of the union, not the one in the error message.