[OpenAPI] integers have additional string type with pattern

[martincostello]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

It might be this is a feature, and I just haven't seen the change documentation for it.

For integer properties in OpenAPI 3.0 documents, the schema has gained string and a pattern. For example:

age: {
+ pattern: ^-?(?:0|[1-9]\d*)$,
  type: [
    null,
-   integer
+   integer,
+   string
  ],
  description: The age of the dog, if known.,
  format: int32
}

Expected Behavior

If this isn't intentional, then the string typeandpattern` should not be emitted.

Steps To Reproduce

1. Clone martincostello/openapi-extensions@e660bb4
2. Run dotnet test from the root of the repository

Exceptions (if any)

No response

.NET Version

10.0.100-preview.2.25164.34

Anything else?

No response

[martincostello]

It just occurred to me that this form of type is specific to OpenAPI 3.1, but if I switch back to OpenAPI 3.0 the effect is similar:

unix: {
- type: integer,
+ pattern: ^-?(?:0|[1-9]\d*)$,
  description: The number of seconds since the UNIX epoch.,
  format: int64
}