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That is very likely a codegen bug... Which resource are you trying set the property on because it should probably be typed as `Input[str | None]`

It’s `azure-native &gt; network.ARecordArgs` here: <https://github.com/pulumi/pulumi-azure-native/blob/master/sdk/python/pulumi_azure_native/network/_inputs.py#L298>.

The type hint is `ipv4_address: Optional[pulumi.Input[str]]`  which gets interpreted as `Input[str] | None`.

Yup thanks that's a bug in the code generator, I thought we already had a bug report for that but I can't find it now.
I'll double check again and get an issue raised for this, should be a very quick fix.

<https://github.com/pulumi/pulumi/issues/12105>