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First, in a pod spec, I had the following for an env var:
```
{
                                "name": "VAULT_REDIRECT_ADDR",
                                "valueFrom:": {
                                    "configMapKeyRef": {
                                        "name": "config",
                                        "key": "vault-addr",
                                    }
                                },
                            },
```

Notice that there's an extra colon in `"valueFrom:"` just a silly typo.

`pulumi up` worked fine, and what I ended up with was an empty env var in my pod.

```
spec:
  containers:
  - env:
    - name: VAULT_REDIRECT_ADDR
```

The other case was me trying to abstract a pod spec `affinity` statement out into a function.

```
def self_antiaffinity(namespace, component):
    """Returns a pod spec affinity block specifying antiaffinity with other pods
    with this component."""

    return {
        "affinity": {
            "podAntiAffinity": {
                "requiredDuringSchedulingIgnoredDuringExecution": [
                    {
                        "labelSelector": {
                            "matchExpressions": [
                                {
                                    "key": "component",
                                    "operator": "In",
                                    "values": [
                                        component,
                                    ],
                                },
                            ],
                        },
                        "namespaces": [
                            namespace,
                        ],
                        "topologyKey": "<http://kubernetes.io/hostname|kubernetes.io/hostname>",
                    },
                ],
            },
        }
    }
```

And then I use it in my spec like so:
```
vault_deployment = appsv1.Deployment(
    "vault",
    spec={
        "affinity": self_antiaffinity(namespace, "vault")
    }
)
```

The mistake I've made here is that there's an extra `"affinity"` key, so I end up with nested `{"affinity": {"affinity": ...}}`, which is incorrect.

But again, `pulumi up` worked, and what I actually got in my spec was `affinity: {}`.

<@UP28YBH5E> the API server, bizarrely, does not reject certain classes of errors, like this

I’m not sure why. It’s very odd indeeed.

we depend on it to do the validation, and over time I’ve just kind of hoped they fix this, but they haven’t.

I’m not entirely sure, yet, how we’d fix this downstream

If you use TypeScript, this is “solved” by the fact that TS types don’t allow you to have random extra fields,

For Python there might not be a good answer