default on enum can causes TypeError(InvalidValue)

I have a failing input OAS being emitted from a https://github.com/tiangolo/fastapi service, which I've trimmed down to this sample

openapi: 3.0.2
info:
    title: FastAPI
    version: 0.1.0
paths: {}
components:
    schemas:
        A:
            properties:
                version:
                    title: Version
                    enum:
                        - foo
                    type: string
        B:
            properties:
                version:
                    title: Version
                    enum:
                        - bar
                    type: string
                    default: bar

This fails in progenitor with

gen fail: TypeError(InvalidValue)
Error: generation experienced errors

This fails at https://github.com/oxidecomputer/typify/blob/d579a52/typify-impl/src/defaults.rs#L82

Remove the default: bar and the error goes away.

Part of the cause is the title: Version being common on two different enums.

Run progenitor generation with the trimmed OpenAPI sample and then inspect typify-impl/src/defaults.rs at line 82. Compare the result with the sample after removing default: bar; done means the schemas with distinct enum values and the shared title no longer produce TypeError(InvalidValue).