Discriminators and internally tagged enums

Hello! Thanks so much for typify.

I have a relatively simple issue to explain, with some code samples. I have some discriminated unions which simply need #[serde(tag = "my_type")] instead of #[serde(untagged)] but they keep coming up untagged. This leads to one item getting parsed as the other and vice versa, which isn't what I want. I can edit the generated code, but I'd really love to get typify to honor the discriminator.propertyName that pydantic produces in its jsonschema as the preferred tag.

Of course propertyName is some offshoot of jsonschema proper (OAI I suppose), but it solves a problem and I'd love to either support it directly or have a way to override the parameters of the serde field attribute programmatically?

In short:

      {
        "discriminator": {
          "mapping": {
            "Baz": "#/$defs/Baz",
            "FooBar": "#/$defs/FooBar"
          },
          "propertyName": "my_type"
        },
        "oneOf": [
          {
            "$ref": "#/$defs/FooBar"
          },
          {
            "$ref": "#/$defs/Baz"
          }
        ]
      }

produces an attribute of:
#[serde(untagged)]
when in my opinion (and experience because changing this works) it should produce:
#[serde(tag="my_type") based off of propertyName.

I put the runnable example code in a repo: https://github.com/rseymour/typify-tag-example/tree/main

I think I could fix this myself, but I haven't been able to correlate the code to the strings it outputs for annotations.

[addendum]
If there's a way to fix the jsonschema itself to produce internally tagged enums that's also an option.

Start with the typify code that handles JSON Schema discriminators and emits serde enum attributes, using the linked typify-tag-example repository as the reproduction case. Trace how the shown discriminator with propertyName is currently turned into #[serde(untagged)]. Done means the example generates an internally tagged enum with the requested property, or a clearly defined programmatic override is supported.